What were you trying to do that didn't work?

Custoemer was trying to upgrade machine with postfix set up with:

default_database_type = lmdb
alias_database = lmdb:/etc/aliases
alias_maps = lmdb:/etc/aliases

What is the impact of this issue to you?

Postfix won't start after the upgrade.

Please provide the package NVR for which the bug is seen:

postfix-3.5.25-1.el9

How reproducible is this bug?:

Always

Steps to reproduce

1. Try to upgrade from rhel 9 to rhel 10 with postfix set up with lmdb hash type.

Expected results

Upgrade makes user at least aware of unsupported configuration.

Actual results

No information is given and postfix is broken after upgrade.