Bounce email handling
We currently don't do proper handling of bounce emails (or none at all). This is bad and our email provider does not like this (and they are right here).
So...
- Change setup so bounce mails are able to be fetched by the platform
- Handle bounces properly. This is a bit tricky:
- Bounces for activation mails? -> Remove account
- Bounces for user generated mail? -> Ignore / count & note permanent bounces to not send more mails to that person
- Bounce for autogenerated mail (e.g. to a user) ? -> Disable mailing to that user, show them a note???