On 29. Mar 2020, at 17.07, Timo Sirainen
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: diff --git a/src/plugins/mail-crypt/mail-crypt-plugin.c b/src/plugins/mail-crypt/mail-crypt-plugin.c index 43ece3d3b..a37fb4a35 100644 --- a/src/plugins/mail-crypt/mail-crypt-plugin.c +++ b/src/plugins/mail-crypt/mail-crypt-plugin.c @@ -345,7 +345,7 @@ static void mail_crypt_mailbox_close(struct mailbox *box) { struct mail_crypt_mailbox *mbox = MAIL_CRYPT_CONTEXT(box); struct mail_crypt_user *muser = - MAIL_CRYPT_USER_CONTEXT_REQUIRE(box->storage->user); + MAIL_CRYPT_USER_CONTEXT(box->storage->user); if (mbox->pub_key != NULL) dcrypt_key_unref_public(&mbox->pub_key);