Some strange errors started occurring after the up/downgrade from 0.4.1 -> 0.4.2 -> 0.4.1. For example, an email from one alias to another failed because it was being greylisted.
I also noticed that in responding to an email, I got a “relay access denied” error. This was to another user on my instance of MIAB. Any ideas as to what the problem could be?
Both of these examples are using Thunderbird. The Roundcube web interface does not seem to suffer the same problem.