# What this PR does
Email tasks are failing and retrying when they use the fallback default
notification policy as it does not get saved in the DB. This PR uses the
same way as UserNotificationPolicyLogRecord to set that field to null to
avoid `ValueError("save() prohibited to prevent data loss due to unsaved
related object 'notification_policy'.").` when that is the case.
## Which issue(s) this PR closes
Related to [issue link here]
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## Checklist
- [x] Unit, integration, and e2e (if applicable) tests updated
- [x] Documentation added (or `pr:no public docs` PR label added if not
required)
- [x] Added the relevant release notes label (see labels prefixed w/
`release:`). These labels dictate how your PR will
show up in the autogenerated release notes.
# What this PR does
Change email notification templates to not wrap the user template in a
fixed body. Info has been moved to a footer. The title now also matches
the template from the user exactly and will only get a default message
if the user template result is empty.
Example:
## Which issue(s) this PR fixes
#3857
## Checklist
- [x] Unit, integration, and e2e (if applicable) tests updated
- [x] Documentation added (or `pr:no public docs` PR label added if not
required)
- [x] `CHANGELOG.md` updated (or `pr:no changelog` PR label added if not
required)
* DEFAULT_FROM_EMAIL -> EMAIL_FROM
* add EMAIL_FROM live setting
* EMAIL_FROM -> EMAIL_FROM_ADDRESS
* merge dev
* add test for get_from_email
* allow live settings to be null on internal API
* remove redundant tests
* remove email verification related code
* remove email verification related code
* remove sendgrid callback
* remove sendgrid related code
* remove sendgrid related code
* rename sendgrid app to email
* remove email from built-in channels
* remove email from built-in channels
* remove email from built-in channels
* add email backend: https://github.com/grafana/oncall/pull/50
* add email templater
* add email templater
* convert md to html
* add email settings to live settings
* use task to send email, handle some exceptions to create logs
* remove ERROR_NOTIFICATION_MAIL_DELIVERY_FAILED usage
* add email limit logic
* fix tests
* add docs
* remove old email templates
* remove old email templates
* add template_fields to messaging backend
* add messaging backends templates to public api
* add comment for deprecated fields
* fix test
* fix tests
* disable email by default
* don't retry on SMTPException and TimeoutError
* add tests
* bring email back to public api docs
* return ERROR_NOTIFICATION_MAIL_LIMIT_EXCEEDED
* make template_fields tuple
* build_subject_and_title -> build_subject_and_message
* add one more comment about template deprecation
* use 8 as backend id
* add comment about gaierror and BadHeaderError
* add comment on importing in notify_user_async
* edit oss docs
