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=3b26b4bfd9c12978254d7c4e6469fabb
But hey, you don't have to leave empty handed!
Here are some things you can try instead: