Feature: mailing list mirroring
Every new message on the forum could be also sent to a mailing list (possibly in a way that allows threading).
It would be awsome if people could also reply to the emails on the mailing list and nimforum coulld ingest them and replicate them in the forum (effectivly mirroring the mailing list)
- [x] Forum to mailing list
- [x] Sender/Resent-From field
- [ ] Email threading
- [ ] Mailing list to forum
