On 31. Mar 2020, at 13.47, Timo Sirainen <t...@sirainen.com> wrote: > > On 29. Mar 2020, at 17.07, Timo Sirainen <t...@sirainen.com> wrote: >> >>> This is what the log says in the moment of crashing: >>> dovecot: lmtp(53852): Panic: Module context mail_crypt_user_module missing >>> *** backtrace *** (see: https://pastebin.com/YCiFtxmy) >> >> It shows mailbox_free() in the backtrace, so it's probably crashing in >> mail_crypt_mailbox_close()'s MAIL_CRYPT_CONTEXT(box). But looking at the >> code, I can't see how that could be possible. Maybe there is some kind of >> memory corruption or something. > > > Looks like there's a bug when some users have mail_crypt plugin loaded and > other users don't. If LMTP delivers a mail to both users within the same > session, it crashes at deinit. A workaround could be to tell MTA to deliver > to max recipient at a time. We'll get this fixed also to some future release. > You could also apply a patch:
Looks like there is also a better way to do this. Enable mail_crypt plugin always in dovecot.conf, but return mail_crypt_save_version differently for users. So mail_crypt_save_version=0 for users who don't want encryption, mail_crypt_save_version=2 for users who do want encryption.
