Set a self reference in initial notification
What does this MR do and why?
Set a self reference in initial notification
This allows mail clients to display in the same thread initial notification and further responses even when using a mail provider
fix #215666
References
How to set up and validate locally
In the Gitlab configuration configure the smtp server with a mail provider like Mailjet who is overriding the Message-ID
Open an Issue. Then add a comment later.
The two mail notifications should be in the same mail thread