stages/email: prevent authentik emails from being marked as spam (also add text template support) (#7949)

* use <> style email address with name

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* add support for text templates

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* fix icon display in event log

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* add text email templates

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* update docs, update email screenshot

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* prevent prettier from breaking example template

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* Optimised images with calibre/image-actions

* Apply suggestions from code review

Co-authored-by: Marc 'risson' Schmitt <marc.schmitt@risson.space>
Signed-off-by: Jens L. <jens@beryju.org>

* reword docs

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

---------

Signed-off-by: Jens Langhammer <jens@goauthentik.io>
Signed-off-by: Jens L. <jens@beryju.org>
Co-authored-by: authentik-automation[bot] <135050075+authentik-automation[bot]@users.noreply.github.com>
Co-authored-by: Marc 'risson' Schmitt <marc.schmitt@risson.space>

authentik/events/models.py

@@ -461,7 +461,7 @@ class NotificationTransport(SerializerModel):
             }
         mail = TemplateEmailMessage(
             subject=subject_prefix + context["title"],
-            to=[notification.user.email],
+            to=[f"{notification.user.name} <{notification.user.email}>"],
             language=notification.user.locale(),
             template_name="email/event_notification.html",
             template_context=context,