Debian Upgrade Stretch To Buster
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This article contains all problems that I encountered when upgrading Debian from 9/Stretch to 10/Buster. Since Debian 9 is already out of standard support, this should not affect a lot of people.
authmysqlrc
"authdaemond: marker line not found in /etc/courier/authmysqlrc" in /var/log/mail.err
Solution: Add these lines at the end of the file:
##NAME: MARKER:0 # # Do not remove this section from this configuration file. This section # must be present at the end of this file.
Credits: https://sources.debian.org/src/courier-authlib/0.69.0-2/authmysqlrc/ (found by googling "authmysqlrc example")