GitLab now has 'reply by e-mail' enabled

[Vladimir Sedach]

> When you receive a notification e-mail from our GitLab instance, you can
> now send a reply to that notification. If the notification was from an
> issue being updated, then your reply will update the issue with a follow-up
> commont.

Very handy, thank you!

For anyone that wants to use this, you probably want to set
notification settings to "Watch" in Settings > Notifications in the
web UI to get emails about new issues.

Vladimir