Replying to GitHub notifications

[danth]

Is your feature request related to a problem? Please describe.

When replying to email notifications from GitHub, the original notification gets posted along with the new message.

GitHub tries to remove quoted replies to avoid this, but it seems like the format Nextcloud Mail produces is not compatible.

Describe the solution you'd like

Adjust the quote format to be compatible with GitHub's parser.

I think the problems are:

• This Links: section being created below the quoted content
• The editor using HTML because the notification was HTML, despite me having plain text set as preferred

Describe alternatives you've considered

Detect Reply-to: *@reply.github.com, List-ID: * <*.github.com>, or some other indicator, and automatically disable sending the quote as a special case.

Additional context