Creating issues by email or commenting on merge requests by mail is not working in Gitlab
Gitlab has the option to do various tasks, like creating issues and commenting on merge requests, by email. I tried both commenting on merge requests and creating an issue and both failed. Looking at my mail headers they look good (according to https://docs.gitlab.com/ee/administration/reply_by_email.html), so something else is wrong.
Another interesting bit is that I only sent an email trying to create a particular issue (no GUI interaction after/before) and arma is getting a notification (there is no "arma" string in the mail body), yet there is no issue in Gitlab created.