We tried, but could not find /doku.php?id=doku.php.faq:installation:configuring_postfix_to_validate_email_addresses_against_a_citadel_server&do=login§ok=9c763f7febef420d45b9a6fc26ed5a2c
But hey, you don't have to leave empty handed!
Here are some things you can try instead: