diff --git a/core/action/Action.php b/core/action/Action.php
new file mode 100644
index 000000000..789860d80
--- /dev/null
+++ b/core/action/Action.php
@@ -0,0 +1,234 @@
+<?php
+
+/**
+ * A user defined action, to customize the application
+ *
+ * @package     iTopORM
+ */
+abstract class Action extends cmdbAbstractObject
+{
+    /**
+     * @throws \CoreException
+     * @throws \Exception
+     */
+    public static function Init()
+    {
+        $aParams = array
+        (
+            "category" => "grant_by_profile,core/cmdb",
+            "key_type" => "autoincrement",
+            "name_attcode" => "name",
+            "complementary_name_attcode" => ['finalclass', 'description'],
+            "state_attcode" => "status",
+            "reconc_keys" => ['name'],
+            "db_table" => "priv_action",
+            "db_key_field" => "id",
+            "db_finalclass_field" => "realclass",
+            "style" => new ormStyle("ibo-dm-class--Action", "ibo-dm-class-alt--Action", "var(--ibo-dm-class--Action--main-color)", "var(--ibo-dm-class--Action--complementary-color)", null, '../images/icons/icons8-in-transit.svg'),
+        );
+        MetaModel::Init_Params($aParams);
+        //MetaModel::Init_InheritAttributes();
+        MetaModel::Init_AddAttribute(new AttributeString("name", array("allowed_values" => null, "sql" => "name", "default_value" => null, "is_null_allowed" => false, "depends_on" => array())));
+        MetaModel::Init_AddAttribute(new AttributeString("description", array("allowed_values" => null, "sql" => "description", "default_value" => null, "is_null_allowed" => true, "depends_on" => array())));
+
+        MetaModel::Init_AddAttribute(new AttributeEnum("status", array(
+            "allowed_values" => new ValueSetEnum(array('test' => 'Being tested', 'enabled' => 'In production', 'disabled' => 'Inactive')),
+            "styled_values" => [
+                'test' => new ormStyle('ibo-dm-enum--Action-status-test', 'ibo-dm-enum-alt--Action-status-test', 'var(--ibo-dm-enum--Action-status-test--main-color)', 'var(--ibo-dm-enum--Action-status-test--complementary-color)', null, null),
+                'enabled' => new ormStyle('ibo-dm-enum--Action-status-enabled', 'ibo-dm-enum-alt--Action-status-enabled', 'var(--ibo-dm-enum--Action-status-enabled--main-color)', 'var(--ibo-dm-enum--Action-status-enabled--complementary-color)', 'fas fa-check', null),
+                'disabled' => new ormStyle('ibo-dm-enum--Action-status-disabled', 'ibo-dm-enum-alt--Action-status-disabled', 'var(--ibo-dm-enum--Action-status-disabled--main-color)', 'var(--ibo-dm-enum--Action-status-disabled--complementary-color)', null, null),
+            ],
+            "display_style" => 'list',
+            "sql" => "status",
+            "default_value" => "test",
+            "is_null_allowed" => false,
+            "depends_on" => array(),
+        )));
+
+        MetaModel::Init_AddAttribute(new AttributeLinkedSetIndirect("trigger_list",
+            array("linked_class" => "lnkTriggerAction", "ext_key_to_me" => "action_id", "ext_key_to_remote" => "trigger_id", "allowed_values" => null, "count_min" => 0, "count_max" => 0, "depends_on" => array(), "display_style" => 'property')));
+        MetaModel::Init_AddAttribute(new AttributeEnum("asynchronous", array("allowed_values" => new ValueSetEnum(['use_global_setting' => 'Use global settings', 'yes' => 'Yes', 'no' => 'No']), "sql" => "asynchronous", "default_value" => 'use_global_setting', "is_null_allowed" => false, "depends_on" => array())));
+
+        // Display lists
+        // - Attributes to be displayed for the complete details
+        MetaModel::Init_SetZListItems('details', array('name', 'description', 'status', 'trigger_list'));
+        // - Attributes to be displayed for a list
+        MetaModel::Init_SetZListItems('list', array('finalclass', 'name', 'description', 'status'));
+        // Search criteria
+        // - Default criteria of the search form
+        MetaModel::Init_SetZListItems('default_search', array('name', 'description', 'status'));
+
+    }
+
+    /**
+     * Encapsulate the execution of the action and handle failure & logging
+     *
+     * @param \Trigger $oTrigger
+     * @param array $aContextArgs
+     *
+     * @return mixed
+     */
+    abstract public function DoExecute($oTrigger, $aContextArgs);
+
+    /**
+     * @return bool
+     * @throws \ArchivedObjectException
+     * @throws \CoreException
+     */
+    public function IsActive()
+    {
+        switch ($this->Get('status')) {
+            case 'enabled':
+            case 'test':
+                return true;
+
+            default:
+                return false;
+        }
+    }
+
+    /**
+     * Return true if the current action status is set on "test"
+     *
+     * @return bool
+     * @throws \ArchivedObjectException
+     * @throws \CoreException
+     */
+    public function IsBeingTested()
+    {
+        switch ($this->Get('status')) {
+            case 'test':
+                return true;
+
+            default:
+                return false;
+        }
+    }
+
+    /**
+     * @inheritDoc
+     * @since 3.0.0
+     */
+    public function AfterInsert()
+    {
+        parent::AfterInsert();
+        $this->DoCheckIfHasTrigger();
+    }
+
+    /**
+     * @inheritDoc
+     * @since 3.0.0
+     */
+    public function AfterUpdate()
+    {
+        parent::AfterUpdate();
+        $this->DoCheckIfHasTrigger();
+    }
+
+    /**
+     * Check if the Action has at least 1 trigger linked. Otherwise, it adds a warning.
+     * @return void
+     * @since 3.0.0
+     */
+    protected function DoCheckIfHasTrigger()
+    {
+        $oTriggersSet = $this->Get('trigger_list');
+        if ($oTriggersSet->Count() === 0) {
+            $this->m_aCheckWarnings[] = Dict::S('Action:WarningNoTriggerLinked');
+        }
+    }
+
+    /**
+     * @since 3.2.0 N°5472 method creation
+     */
+    public function DisplayBareRelations(\Combodo\iTop\Application\WebPage\WebPage $oPage, $bEditMode = false)
+    {
+        parent::DisplayBareRelations($oPage, false);
+
+        if ($oPage instanceof iTopWebPage && !$this->IsNew()) {
+            $this->GenerateLastExecutionsTab($oPage, $bEditMode);
+        }
+    }
+
+    /**
+     * @since 3.2.0 N°5472 method creation
+     */
+    protected function GenerateLastExecutionsTab(iTopWebPage $oPage, $bEditMode)
+    {
+        $oRouter = \Combodo\iTop\Service\Router\Router::GetInstance();
+        $sActionLastExecutionsPageUrl = $oRouter->GenerateUrl('notifications.action.last_executions_tab', ['action_id' => $this->GetKey()]);
+        $oPage->AddAjaxTab('action_errors', $sActionLastExecutionsPageUrl, false, Dict::S('Action:last_executions_tab'));
+    }
+
+    /**
+     * @param \Combodo\iTop\Application\WebPage\WebPage $oPage
+     *
+     * @throws \ApplicationException
+     * @throws \ArchivedObjectException
+     * @throws \ConfigException
+     * @throws \CoreException
+     * @throws \CoreUnexpectedValue
+     * @throws \DictExceptionMissingString
+     * @throws \InvalidConfigParamException
+     * @throws \MissingQueryArgument
+     * @throws \MySQLException
+     * @throws \MySQLHasGoneAwayException
+     * @throws \OQLException
+     * @throws \ReflectionException
+     * @since 3.2.0 N°5472 method creation
+     */
+    public function GetLastExecutionsTabContent(\Combodo\iTop\Application\WebPage\WebPage $oPage): void
+    {
+        $oConfig = utils::GetConfig();
+        $sLastExecutionDaysConfigParamName = 'notifications.last_executions_days';
+        $iLastExecutionDays = $oConfig->Get($sLastExecutionDaysConfigParamName);
+
+        if ($iLastExecutionDays < 0) {
+            throw new InvalidConfigParamException("Invalid value for {$sLastExecutionDaysConfigParamName} config parameter. Param desc: " . $oConfig->GetDescription($sLastExecutionDaysConfigParamName));
+        }
+
+        $sActionQueryOql = 'SELECT EventNotification WHERE action_id = :action_id';
+        $aActionQueryParams = ['action_id' => $this->GetKey()];
+        if ($iLastExecutionDays > 0) {
+            $sActionQueryOql .= ' AND date > DATE_SUB(NOW(), INTERVAL :days DAY)';
+            $aActionQueryParams['days'] = $iLastExecutionDays;
+            $sActionQueryLimit = Dict::Format('Action:last_executions_tab_limit_days', $iLastExecutionDays);
+        } else {
+            $sActionQueryLimit = Dict::S('Action:last_executions_tab_limit_none');
+        }
+
+        $oActionFilter = DBObjectSearch::FromOQL($sActionQueryOql, $aActionQueryParams);
+        $oSet = new DBObjectSet($oActionFilter, ['date' => false]);
+
+        $sPanelTitle = Dict::Format('Action:last_executions_tab_panel_title', $sActionQueryLimit);
+        $oExecutionsListBlock = \Combodo\iTop\Application\UI\Base\Component\DataTable\DataTableUIBlockFactory::MakeForResult($oPage, 'action_executions_list', $oSet, ['panel_title' => $sPanelTitle]);
+
+        $oPage->AddUiBlock($oExecutionsListBlock);
+    }
+
+    /**
+     * Will be overloaded by the children classes to return the value of their global asynchronous setting (eg. `email_asynchronous` for `\ActionEmail`, `prefer_asynchronous` for `\ActionWebhook`, ...)
+     *
+     * @return bool true if the global setting for this kind of action if to be executed asynchronously, false otherwise.
+     * @since 3.2.0
+     */
+    public static function GetAsynchronousGlobalSetting(): bool
+    {
+        return false;
+    }
+
+    /**
+     * @return bool true if that action instance should be executed asynchronously, otherwise false
+     * @throws \ArchivedObjectException
+     * @throws \CoreException
+     * @since 3.2.0
+     */
+    public function IsAsynchronous(): bool
+    {
+        $sAsynchronous = $this->Get('asynchronous');
+        if ($sAsynchronous === 'use_global_setting') {
+            return static::GetAsynchronousGlobalSetting();
+        }
+        return $sAsynchronous === 'yes';
+    }
+}
\ No newline at end of file
diff --git a/core/action/ActionEmail.php b/core/action/ActionEmail.php
new file mode 100644
index 000000000..87ffe0f2e
--- /dev/null
+++ b/core/action/ActionEmail.php
@@ -0,0 +1,567 @@
+<?php
+
+/**
+ * An email notification
+ *
+ * @package     iTopORM
+ */
+class ActionEmail extends ActionNotification
+{
+    /**
+     * @var string
+     * @since 3.0.1
+     */
+    const ENUM_HEADER_NAME_MESSAGE_ID = 'Message-ID';
+    /**
+     * @var string
+     * @since 3.0.1
+     */
+    const ENUM_HEADER_NAME_REFERENCES = 'References';
+    /**
+     * @var string
+     * @since 3.1.0
+     */
+    const TEMPLATE_BODY_CONTENT = '$content$';
+    /**
+     * Wraps the 'body' of the message for previewing inside an IFRAME -- i.e. without any of the iTop stylesheets being applied
+     * @var string
+     * @since 3.1.0
+     */
+    const CONTENT_HIGHLIGHT = '<div style="border:2px dashed #6800ff;position:relative;padding:2px;margin-top:14px;"><div style="background-color:#6800ff;color:#fff;font-family:Courier New, sans-serif;font-size:14px;line-height:16px;padding:3px;display:block;position:absolute;top:-22px;right:0;">$content$</div>%s</div>';
+    /**
+     * Wraps a placeholder of the email's body for previewing inside an IFRAME -- i.e. without any of the iTop stylesheets being applied
+     * @var string
+     */
+    const FIELD_HIGHLIGHT = '<span style="background-color:#6800ff;color:#fff;font-size:smaller;font-family:Courier New, sans-serif;padding:2px;">\\$$1\\$</span>';
+
+    /**
+     * @inheritDoc
+     */
+    public static function Init()
+    {
+        $aParams = array
+        (
+            "category" => "grant_by_profile,core/cmdb,application",
+            "key_type" => "autoincrement",
+            "name_attcode" => "name",
+            "state_attcode" => "",
+            "reconc_keys" => array('name'),
+            "db_table" => "priv_action_email",
+            "db_key_field" => "id",
+            "db_finalclass_field" => "",
+            'style' => new ormStyle(null, null, null, null, null, '../images/icons/icons8-mailing.svg'),
+        );
+        MetaModel::Init_Params($aParams);
+        MetaModel::Init_InheritAttributes();
+
+        MetaModel::Init_AddAttribute(new AttributeEmailAddress("test_recipient", array("allowed_values" => null, "sql" => "test_recipient", "default_value" => "", "is_null_allowed" => true, "depends_on" => array())));
+
+        MetaModel::Init_AddAttribute(new AttributeString("from", array("allowed_values" => null, "sql" => "from", "default_value" => null, "is_null_allowed" => false, "depends_on" => array())));
+        MetaModel::Init_AddAttribute(new AttributeString("from_label", array("allowed_values" => null, "sql" => "from_label", "default_value" => null, "is_null_allowed" => true, "depends_on" => array())));
+        MetaModel::Init_AddAttribute(new AttributeString("reply_to", array("allowed_values" => null, "sql" => "reply_to", "default_value" => null, "is_null_allowed" => true, "depends_on" => array())));
+        MetaModel::Init_AddAttribute(new AttributeString("reply_to_label", array("allowed_values" => null, "sql" => "reply_to_label", "default_value" => null, "is_null_allowed" => true, "depends_on" => array())));
+        MetaModel::Init_AddAttribute(new AttributeOQL("to", array("allowed_values" => null, "sql" => "to", "default_value" => null, "is_null_allowed" => true, "depends_on" => array())));
+        MetaModel::Init_AddAttribute(new AttributeOQL("cc", array("allowed_values" => null, "sql" => "cc", "default_value" => null, "is_null_allowed" => true, "depends_on" => array())));
+        MetaModel::Init_AddAttribute(new AttributeOQL("bcc", array("allowed_values" => null, "sql" => "bcc", "default_value" => null, "is_null_allowed" => true, "depends_on" => array())));
+        MetaModel::Init_AddAttribute(new AttributeTemplateString("subject", array("allowed_values" => null, "sql" => "subject", "default_value" => null, "is_null_allowed" => false, "depends_on" => array())));
+        MetaModel::Init_AddAttribute(new AttributeTemplateHTML("body", array("allowed_values" => null, "sql" => "body", "default_value" => null, "is_null_allowed" => false, "depends_on" => array())));
+        MetaModel::Init_AddAttribute(new AttributeEnum("importance", array("allowed_values" => new ValueSetEnum('low,normal,high'), "sql" => "importance", "default_value" => 'normal', "is_null_allowed" => false, "depends_on" => array())));
+        MetaModel::Init_AddAttribute(new AttributeBlob("html_template", array("is_null_allowed" => true, "depends_on" => array(), "always_load_in_tables" => false)));
+        MetaModel::Init_AddAttribute(new AttributeEnum("ignore_notify", array("allowed_values" => new ValueSetEnum('yes,no'), "sql" => "ignore_notify", "default_value" => 'yes', "is_null_allowed" => false, "depends_on" => array())));
+
+
+        // Display lists
+        // - Attributes to be displayed for the complete details
+        MetaModel::Init_SetZListItems('details', array(
+            'col:col1' => array(
+                'fieldset:ActionEmail:main' => array(
+                    0 => 'name',
+                    1 => 'description',
+                    2 => 'status',
+                    3 => 'language',
+                    4 => 'html_template',
+                    5 => 'subject',
+                    6 => 'body',
+                    // 5 => 'importance', not handled when sending the mail, better hide it then
+                ),
+                'fieldset:ActionEmail:trigger' => array(
+                    0 => 'trigger_list',
+                    1 => 'asynchronous'
+                ),
+            ),
+            'col:col2' => array(
+                'fieldset:ActionEmail:recipients' => array(
+                    0 => 'from',
+                    1 => 'from_label',
+                    2 => 'reply_to',
+                    3 => 'reply_to_label',
+                    4 => 'test_recipient',
+                    5 => 'ignore_notify',
+                    6 => 'to',
+                    7 => 'cc',
+                    8 => 'bcc',
+                ),
+            ),
+        ));
+
+        // - Attributes to be displayed for a list
+        MetaModel::Init_SetZListItems('list', array('status', 'to', 'subject', 'language'));
+        // Search criteria
+        // - Standard criteria of the search
+        MetaModel::Init_SetZListItems('standard_search', array('name', 'description', 'status', 'subject', 'language'));
+        // - Default criteria for the search
+        MetaModel::Init_SetZListItems('default_search', array('name', 'description', 'status', 'subject', 'language'));
+    }
+
+    // count the recipients found
+    protected $m_iRecipients;
+
+    // Errors management : not that simple because we need that function to be
+    // executed in the background, while making sure that any issue would be reported clearly
+    protected $m_aMailErrors; //array of strings explaining the issue
+
+    /**
+     * Return the list of emails as a string, or a detailed error description
+     *
+     * @param string $sRecipAttCode
+     * @param array $aArgs
+     *
+     * @return string
+     * @throws \ArchivedObjectException
+     * @throws \CoreCannotSaveObjectException
+     * @throws \CoreException
+     * @throws \CoreUnexpectedValue
+     * @throws \CoreWarning
+     * @throws \MissingQueryArgument
+     * @throws \MySQLException
+     * @throws \MySQLHasGoneAwayException
+     * @throws \OQLException
+     */
+    protected function FindRecipients($sRecipAttCode, $aArgs)
+    {
+        $oTrigger = $aArgs['trigger->object()'] ?? null;
+        $sOQL = $this->Get($sRecipAttCode);
+        if (utils::IsNullOrEmptyString($sOQL)) return '';
+
+        try {
+            $oSearch = DBObjectSearch::FromOQL($sOQL);
+            if ($this->Get('ignore_notify') === 'no') {
+                // In theory, it is possible to notify *any* kind of object,
+                // as long as there is an email attribute in the class
+                // So let's not assume that the selected class is a Person
+                $sFirstSelectedClass = $oSearch->GetClass();
+                if (MetaModel::IsValidAttCode($sFirstSelectedClass, 'notify')) {
+                    $oSearch->AddCondition('notify', 'yes');
+                }
+            }
+            $oSearch->AllowAllData();
+        } catch (OQLException $e) {
+            $this->m_aMailErrors[] = "query syntax error for recipient '$sRecipAttCode'";
+            return $e->getMessage();
+        }
+
+        $sClass = $oSearch->GetClass();
+        // Determine the email attribute (the first one will be our choice)
+        foreach (MetaModel::ListAttributeDefs($sClass) as $sAttCode => $oAttDef) {
+            if ($oAttDef instanceof AttributeEmailAddress) {
+                $sEmailAttCode = $sAttCode;
+                // we've got one, exit the loop
+                break;
+            }
+        }
+        if (!isset($sEmailAttCode)) {
+            $this->m_aMailErrors[] = "wrong target for recipient '$sRecipAttCode'";
+            return "The objects of the class '$sClass' do not have any email attribute";
+        }
+
+        if ($oTrigger !== null && in_array('Contact', MetaModel::EnumParentClasses($sClass, ENUM_CHILD_CLASSES_ALL), true)) {
+            $aArgs['trigger_id'] = $oTrigger->GetKey();
+            $aArgs['action_id'] = $this->GetKey();
+
+            $sSubscribedContactsOQL = \Combodo\iTop\Service\Notification\NotificationsRepository::GetInstance()->GetSearchOQLContactUnsubscribedByTriggerAndAction();
+            $sSubscribedContactsOQL->ApplyParameters($aArgs);
+            $sAlias = $oSearch->GetClassAlias();
+            $oSearch->AddConditionExpression(Expression::FromOQL("`$sAlias`.id NOT IN ($sSubscribedContactsOQL)"));
+        }
+
+        $oSet = new DBObjectSet($oSearch, array() /* order */, $aArgs);
+        $aRecipients = array();
+        while ($oObj = $oSet->Fetch()) {
+            $sAddress = trim($oObj->Get($sEmailAttCode));
+            if (utils::IsNotNullOrEmptyString($sAddress)) {
+                $aRecipients[] = $sAddress;
+                $this->m_iRecipients++;
+            }
+            if ($oTrigger !== null && in_array('Contact', MetaModel::EnumParentClasses($sClass, ENUM_CHILD_CLASSES_ALL), true)) {
+                \Combodo\iTop\Service\Notification\NotificationsService::GetInstance()->RegisterSubscription($oTrigger, $this, $oObj);
+            }
+        }
+        return implode(', ', $aRecipients);
+    }
+
+    /**
+     * @inheritDoc
+     * @throws \CoreException
+     * @throws \CoreUnexpectedValue
+     * @throws \CoreWarning
+     */
+    public function DoExecute($oTrigger, $aContextArgs)
+    {
+        if (MetaModel::IsLogEnabledNotification()) {
+            $oLog = new EventNotificationEmail();
+            if ($this->IsBeingTested()) {
+                $oLog->Set('message', 'TEST - Notification sent (' . $this->Get('test_recipient') . ')');
+            } else {
+                $oLog->Set('message', 'Notification pending');
+            }
+            $oLog->Set('userinfo', UserRights::GetUser());
+            $oLog->Set('trigger_id', $oTrigger->GetKey());
+            $oLog->Set('action_id', $this->GetKey());
+            $oLog->Set('object_id', $aContextArgs['this->object()']->GetKey());
+            $oLog->Set('object_class', get_class($aContextArgs['this->object()']));
+            // Must be inserted now so that it gets a valid id that will make the link
+            // between an eventual asynchronous task (queued) and the log
+            $oLog->DBInsertNoReload();
+        } else {
+            $oLog = null;
+        }
+
+        try {
+            $sRes = $this->_DoExecute($oTrigger, $aContextArgs, $oLog);
+
+            if ($this->IsBeingTested()) {
+                $sPrefix = 'TEST (' . $this->Get('test_recipient') . ') - ';
+            } else {
+                $sPrefix = '';
+            }
+
+            if ($oLog) {
+                $oLog->Set('message', $sPrefix . $sRes);
+                $oLog->DBUpdate();
+            }
+
+        } catch (Exception $e) {
+            if ($oLog) {
+                $oLog->Set('message', 'Error: ' . $e->getMessage());
+
+                try {
+                    $oLog->DBUpdate();
+                } catch (Exception $eSecondTryUpdate) {
+                    IssueLog::Error("Failed to process email " . $oLog->GetKey() . " - reason: " . $e->getMessage() . "\nTrace:\n" . $e->getTraceAsString());
+
+                    $oLog->Set('message', 'Error: more details in the log for email "' . $oLog->GetKey() . '"');
+                    $oLog->DBUpdate();
+                }
+            }
+        }
+
+    }
+
+    /**
+     * @param \Trigger $oTrigger
+     * @param array $aContextArgs
+     * @param \EventNotification $oLog
+     *
+     * @return string
+     * @throws \CoreException
+     * @throws \Exception
+     */
+    protected function _DoExecute($oTrigger, $aContextArgs, &$oLog)
+    {
+        $sStyles = file_get_contents(APPROOT . utils::GetCSSFromSASS("css/email.scss"));
+        $sStyles .= MetaModel::GetConfig()->Get('email_css');
+
+        $oEmail = new EMail();
+
+        $aEmailContent = $this->PrepareMessageContent($aContextArgs, $oLog);
+        $oEmail->SetSubject($aEmailContent['subject']);
+        $oEmail->SetBody($aEmailContent['body'], 'text/html', $sStyles);
+        $oEmail->SetRecipientTO($aEmailContent['to']);
+        $oEmail->SetRecipientCC($aEmailContent['cc']);
+        $oEmail->SetRecipientBCC($aEmailContent['bcc']);
+        $oEmail->SetRecipientFrom($aEmailContent['from'], $aEmailContent['from_label']);
+        $oEmail->SetRecipientReplyTo($aEmailContent['reply_to'], $aEmailContent['reply_to_label']);
+        $oEmail->SetReferences($aEmailContent['references']);
+        $oEmail->SetMessageId($aEmailContent['message_id']);
+        $oEmail->SetInReplyTo($aEmailContent['in_reply_to']);
+
+        foreach ($aEmailContent['attachments'] as $aAttachment) {
+            $oEmail->AddAttachment($aAttachment['data'], $aAttachment['filename'], $aAttachment['mime_type']);
+        }
+
+        if (empty($this->m_aMailErrors)) {
+            if ($this->m_iRecipients == 0) {
+                return 'No recipient';
+            } else {
+                $aErrors = [];
+                $iRes = $oEmail->Send($aErrors, $this->IsAsynchronous() ? Email::ENUM_SEND_FORCE_ASYNCHRONOUS : Email::ENUM_SEND_FORCE_SYNCHRONOUS, $oLog);
+                switch ($iRes) {
+                    case EMAIL_SEND_OK:
+                        return "Sent";
+
+                    case EMAIL_SEND_PENDING:
+                        return "Pending";
+
+                    case EMAIL_SEND_ERROR:
+                        return "Errors: " . implode(', ', $aErrors);
+                }
+            }
+        } else {
+            if (is_array($this->m_aMailErrors) && count($this->m_aMailErrors) > 0) {
+                $sError = implode(', ', $this->m_aMailErrors);
+            } else {
+                $sError = 'Unknown reason';
+            }
+
+            return 'Notification was not sent: ' . $sError;
+        }
+    }
+
+    /**
+     * @param array $aContextArgs
+     * @param \EventNotification $oLog
+     *
+     * @return array
+     * @throws \ArchivedObjectException
+     * @throws \CoreCannotSaveObjectException
+     * @throws \CoreException
+     * @throws \CoreUnexpectedValue
+     * @throws \CoreWarning
+     * @throws \DictExceptionMissingString
+     * @throws \DictExceptionUnknownLanguage
+     * @throws \MissingQueryArgument
+     * @throws \MySQLException
+     * @throws \MySQLHasGoneAwayException
+     * @throws \OQLException
+     * @since 3.1.0 N°918
+     */
+    protected function PrepareMessageContent($aContextArgs, &$oLog): array
+    {
+        $aMessageContent = [
+            'to' => '',
+            'cc' => '',
+            'bcc' => '',
+            'from' => '',
+            'from_label' => '',
+            'reply_to' => '',
+            'reply_to_label' => '',
+            'subject' => '',
+            'body' => '',
+            'references' => '',
+            'message_id' => '',
+            'in_reply_to' => '',
+            'attachments' => [],
+        ];
+        $sPreviousUrlMaker = ApplicationContext::SetUrlMakerClass();
+        [$sPreviousLanguage, $aPreviousPluginProperties] = $this->SetNotificationLanguage();
+
+        try {
+            $this->m_iRecipients = 0;
+            $this->m_aMailErrors = array();
+
+            // Determine recipients
+            //
+            $aMessageContent['to'] = $this->FindRecipients('to', $aContextArgs);
+            $aMessageContent['cc'] = $this->FindRecipients('cc', $aContextArgs);
+            $aMessageContent['bcc'] = $this->FindRecipients('bcc', $aContextArgs);
+
+            $aMessageContent['from'] = MetaModel::ApplyParams($this->Get('from'), $aContextArgs);
+            $aMessageContent['from_label'] = MetaModel::ApplyParams($this->Get('from_label'), $aContextArgs);
+            $aMessageContent['reply_to'] = MetaModel::ApplyParams($this->Get('reply_to'), $aContextArgs);
+            $aMessageContent['reply_to_label'] = MetaModel::ApplyParams($this->Get('reply_to_label'), $aContextArgs);
+
+            $aMessageContent['subject'] = MetaModel::ApplyParams($this->Get('subject'), $aContextArgs);
+            $sBody = $this->BuildMessageBody(false);
+            $aMessageContent['body'] = MetaModel::ApplyParams($sBody, $aContextArgs);
+
+            $oObj = $aContextArgs['this->object()'];
+            $aMessageContent['message_id'] = $this->GenerateIdentifierForHeaders($oObj, static::ENUM_HEADER_NAME_MESSAGE_ID);
+            $aMessageContent['references'] = $this->GenerateIdentifierForHeaders($oObj, static::ENUM_HEADER_NAME_REFERENCES);
+        } catch (Exception $e) {
+            /** @noinspection PhpUnhandledExceptionInspection */
+            throw $e;
+        } finally {
+            ApplicationContext::SetUrlMakerClass($sPreviousUrlMaker);
+            $this->SetNotificationLanguage($sPreviousLanguage, $aPreviousPluginProperties['language_code'] ?? null);
+        }
+
+        if (!is_null($oLog)) {
+            // Note: we have to secure this because those values are calculated
+            // inside the try statement, and we would like to keep track of as
+            // many data as we could while some variables may still be undefined
+            if (isset($aMessageContent['to'])) {
+                $oLog->Set('to', $aMessageContent['to']);
+            }
+            if (isset($aMessageContent['cc'])) {
+                $oLog->Set('cc', $aMessageContent['cc']);
+            }
+            if (isset($aMessageContent['bcc'])) {
+                $oLog->Set('bcc', $aMessageContent['bcc']);
+            }
+            if (isset($aMessageContent['from'])) {
+                $oLog->Set('from', $aMessageContent['from']);
+            }
+            if (isset($aMessageContent['subject'])) {
+                $oLog->Set('subject', $aMessageContent['subject']);
+            }
+            if (isset($aMessageContent['body'])) {
+                $oLog->Set('body', HTMLSanitizer::Sanitize($aMessageContent['body']));
+            }
+        }
+
+        if ($this->IsBeingTested()) {
+            $sTestBody = $aMessageContent['body'];
+            $sTestBody .= "<div style=\"border: dashed;\">\n";
+            $sTestBody .= "<h1>Testing email notification " . $this->GetHyperlink() . "</h1>\n";
+            $sTestBody .= "<p>The email should be sent with the following properties\n";
+            $sTestBody .= "<ul>\n";
+            $sTestBody .= "<li>TO: {$aMessageContent['to']}</li>\n";
+            $sTestBody .= "<li>CC: {$aMessageContent['cc']}</li>\n";
+            $sTestBody .= "<li>BCC: {$aMessageContent['bcc']}</li>\n";
+            $sTestBody .= empty($aMessageContent['from_label']) ? "<li>From: {$aMessageContent['from']}</li>\n" : "<li>From: {$aMessageContent['from_label']} &lt;{$aMessageContent['from']}&gt;</li>\n";
+            $sTestBody .= empty($aMessageContent['reply_to_label']) ? "<li>Reply-To: {$aMessageContent['reply_to']}</li>\n" : "<li>Reply-To: {$aMessageContent['reply_to_label']} &lt;{$aMessageContent['reply_to']}&gt;</li>\n";
+            $sTestBody .= "<li>References: {$aMessageContent['references']}</li>\n";
+            $sTestBody .= "</ul>\n";
+            $sTestBody .= "</p>\n";
+            $sTestBody .= "</div>\n";
+            $aMessageContent['subject'] = 'TEST[' . $aMessageContent['subject'] . ']';
+            $aMessageContent['body'] = $sTestBody;
+            $aMessageContent['to'] = $this->Get('test_recipient');
+            // N°6677 Ensure emails in test are never sent to cc'd and bcc'd addresses
+            $aMessageContent['cc'] = '';
+            $aMessageContent['bcc'] = '';
+        }
+        // Note: N°4849 We pass the "References" identifier instead of the "Message-ID" on purpose as we want notifications emails to group around the triggering iTop object, not just the users' replies to the notification
+        $aMessageContent['in_reply_to'] = $aMessageContent['references'];
+
+        if (isset($aContextArgs['attachments'])) {
+            $aAttachmentReport = array();
+            /** @var \ormDocument $oDocument */
+            foreach ($aContextArgs['attachments'] as $oDocument) {
+                $aMessageContent['attachments'][] = ['data' => $oDocument->GetData(), 'filename' => $oDocument->GetFileName(), 'mime_type' => $oDocument->GetMimeType()];
+                $aAttachmentReport[] = array($oDocument->GetFileName(), $oDocument->GetMimeType(), strlen($oDocument->GetData() ?? ''));
+            }
+            $oLog->Set('attachments', $aAttachmentReport);
+        }
+
+        return $aMessageContent;
+    }
+
+    /**
+     * @param \DBObject $oObject
+     * @param string $sHeaderName {@see \ActionEmail::ENUM_HEADER_NAME_REFERENCES}, {@see \ActionEmail::ENUM_HEADER_NAME_MESSAGE_ID}
+     *
+     * @return string The formatted identifier for $sHeaderName based on $oObject
+     * @throws \Exception
+     * @since 3.1.0 N°4849
+     */
+    protected function GenerateIdentifierForHeaders(DBObject $oObject, string $sHeaderName): string
+    {
+        $sObjClass = get_class($oObject);
+        $sObjId = $oObject->GetKey();
+        $sAppName = utils::Sanitize(ITOP_APPLICATION_SHORT, '', utils::ENUM_SANITIZATION_FILTER_VARIABLE_NAME);
+
+        switch ($sHeaderName) {
+            case static::ENUM_HEADER_NAME_MESSAGE_ID:
+            case static::ENUM_HEADER_NAME_REFERENCES:
+                // Prefix
+                $sPrefix = sprintf('%s_%s_%d', $sAppName, $sObjClass, $sObjId);
+                if ($sHeaderName === static::ENUM_HEADER_NAME_MESSAGE_ID) {
+                    $sPrefix .= sprintf('_%F', microtime(true /* get as float*/));
+                }
+                // Suffix
+                $sSuffix = sprintf('@%s.openitop.org', MetaModel::GetEnvironmentId());
+                // Identifier
+                $sIdentifier = $sPrefix . $sSuffix;
+                if ($sHeaderName === static::ENUM_HEADER_NAME_REFERENCES) {
+                    $sIdentifier = "<$sIdentifier>";
+                }
+
+                return $sIdentifier;
+        }
+
+        // Requested header name invalid
+        $sErrorMessage = sprintf('%s: Could not generate identifier for header "%s", only %s are supported', static::class, $sHeaderName, implode(' / ', [static::ENUM_HEADER_NAME_MESSAGE_ID, static::ENUM_HEADER_NAME_REFERENCES]));
+        IssueLog::Error($sErrorMessage, LogChannels::NOTIFICATIONS, [
+            'Object' => $sObjClass . '::' . $sObjId . ' (' . $oObject->GetRawName() . ')',
+            'Action' => get_class($this) . '::' . $this->GetKey() . ' (' . $this->GetRawName() . ')',
+        ]);
+        throw new Exception($sErrorMessage);
+    }
+
+    /**
+     * Compose the body of the message from the 'body' attribute and the HTML template (if any)
+     * @param bool $bHighlightPlaceholders If true add some extra HTML around placeholders to highlight them
+     * @return string
+     * @since 3.1.0 N°4849
+     */
+    protected function BuildMessageBody(bool $bHighlightPlaceholders = false): string
+    {
+        // Wrap content with a specific class in order to apply styles of HTML fields through the emogrifier (see `css/email.scss`)
+        $sBody = <<<HTML
+<div class="email-is-html-content">
+	{$this->Get('body')}
+</div>
+HTML;
+
+        /**  @var ormDocument $oHtmlTemplate */
+        $oHtmlTemplate = $this->Get('html_template');
+        if ($oHtmlTemplate && !$oHtmlTemplate->IsEmpty()) {
+            $sHtmlTemplate = $oHtmlTemplate->GetData();
+            if (false !== mb_strpos($sHtmlTemplate, static::TEMPLATE_BODY_CONTENT)) {
+                if ($bHighlightPlaceholders) {
+                    // Highlight the $content$ block
+                    $sBody = sprintf(static::CONTENT_HIGHLIGHT, $sBody);
+                }
+                $sBody = str_replace(static::TEMPLATE_BODY_CONTENT, $sBody, $oHtmlTemplate->GetData()); // str_replace is ok as long as both strings are well-formed UTF-8
+            } else {
+                $sBody = $oHtmlTemplate->GetData();
+            }
+        }
+        if ($bHighlightPlaceholders) {
+            // Highlight all placeholders
+            $sBody = preg_replace('/\\$([^$]+)\\$/', static::FIELD_HIGHLIGHT, $sBody);
+        }
+        return $sBody;
+    }
+
+    /**
+     * @since 3.1.0 N°4849
+     * @inheritDoc
+     * @see cmdbAbstractObject::DisplayBareRelations()
+     */
+    public function DisplayBareRelations(\Combodo\iTop\Application\WebPage\WebPage $oPage, $bEditMode = false)
+    {
+        parent::DisplayBareRelations($oPage, false);
+        if (!$bEditMode) {
+            $oPage->SetCurrentTab('action_email__preview', Dict::S('ActionEmail:preview_tab'), Dict::S('ActionEmail:preview_tab+'));
+            $sBody = $this->BuildMessageBody(true);
+            \Combodo\iTop\Application\TwigBase\Twig\TwigHelper::RenderIntoPage($oPage, APPROOT . '/', 'templates/datamodel/ActionEmail/email-notification-preview', ['iframe_content' => $sBody]);
+        }
+    }
+
+    /**
+     * @since 3.1.0
+     * @inheritDoc
+     * @see cmdbAbstractObject::DoCheckToWrite()
+     */
+    public function DoCheckToWrite()
+    {
+        parent::DoCheckToWrite();
+        $oHtmlTemplate = $this->Get('html_template');
+        if ($oHtmlTemplate && !$oHtmlTemplate->IsEmpty()) {
+            if (false === mb_strpos($oHtmlTemplate->GetData(), static::TEMPLATE_BODY_CONTENT)) {
+                $this->m_aCheckWarnings[] = Dict::Format('ActionEmail:content_placeholder_missing', static::TEMPLATE_BODY_CONTENT, Dict::S('Class:ActionEmail/Attribute:body'));
+            }
+        }
+    }
+
+    /**
+     * @inheritDoc
+     * @since 3.2.0
+     */
+    public static function GetAsynchronousGlobalSetting(): bool
+    {
+        return utils::GetConfig()->Get('email_asynchronous');
+    }
+}
\ No newline at end of file
diff --git a/core/action/ActionNotification.php b/core/action/ActionNotification.php
new file mode 100644
index 000000000..1256a7fec
--- /dev/null
+++ b/core/action/ActionNotification.php
@@ -0,0 +1,70 @@
+<?php
+
+/**
+ * A notification
+ *
+ * @package     iTopORM
+ */
+abstract class ActionNotification extends Action
+{
+    /**
+     * @inheritDoc
+     * @throws \CoreException
+     */
+    public static function Init()
+    {
+        $aParams = array
+        (
+            "category" => "grant_by_profile,core/cmdb",
+            "key_type" => "autoincrement",
+            "name_attcode" => "name",
+            "complementary_name_attcode" => ['finalclass', 'description'],
+            "state_attcode" => "",
+            "reconc_keys" => ['name'],
+            "db_table" => "priv_action_notification",
+            "db_key_field" => "id",
+            "db_finalclass_field" => "",
+        );
+        MetaModel::Init_Params($aParams);
+        MetaModel::Init_InheritAttributes();
+
+        // Display lists
+        // - Attributes to be displayed for the complete details
+        MetaModel::Init_SetZListItems('details', array('name', 'description', 'status', 'trigger_list'));
+        // - Attributes to be displayed for a list
+        MetaModel::Init_SetZListItems('list', array('finalclass', 'description', 'status'));
+        MetaModel::Init_AddAttribute(new AttributeApplicationLanguage("language", array("sql" => "language", "default_value" => null, "is_null_allowed" => true, "depends_on" => array())));
+
+        // Search criteria
+        // - Criteria of the std search form
+//		MetaModel::Init_SetZListItems('standard_search', array('name'));
+        // - Default criteria of the search form
+//		MetaModel::Init_SetZListItems('default_search', array('name'));
+    }
+
+    /**
+     * @param $sLanguage
+     * @param $sLanguageCode
+     *
+     * @return array [$sPreviousLanguage, $aPreviousPluginProperties]
+     * @throws \ArchivedObjectException
+     * @throws \CoreException
+     * @throws \DictExceptionUnknownLanguage
+     * @since 3.2.0
+     */
+    public function SetNotificationLanguage($sLanguage = null, $sLanguageCode = null)
+    {
+        $sPreviousLanguage = Dict::GetUserLanguage();
+        $aPreviousPluginProperties = ApplicationContext::GetPluginProperties('QueryLocalizerPlugin');
+        $sLanguage = $sLanguage ?? $this->Get('language');
+        $sLanguageCode = $sLanguageCode ?? $sLanguage;
+        if (!utils::IsNullOrEmptyString($sLanguage)) {
+            // If a language is specified for this action, force this language
+            // when rendering all placeholders inside this message
+            Dict::SetUserLanguage($sLanguage);
+            AttributeDateTime::LoadFormatFromConfig();
+            ApplicationContext::SetPluginProperty('QueryLocalizerPlugin', 'language_code', $sLanguageCode);
+        }
+        return [$sPreviousLanguage, $aPreviousPluginProperties];
+    }
+}
\ No newline at end of file