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=4a94345425f6655626f26c0b78e8f0e6
But hey, you don't have to leave empty handed!
Here are some things you can try instead: