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=e2d0cd87d63c0a31d5ff2ebe257a30bf
But hey, you don't have to leave empty handed!
Here are some things you can try instead: