i am quite new so please be a bit patient XD i am trying to configure a mail server using postfix (which implements a database for aliases, domains and mailboxes) and courrier on ubuntu. I have this problem when i test the command telnet: 451 4.3.0 : Temporary lookup failure I followed this guide: http://guide.debianizzati.org/index.php/Postfix-mysql#Postfix
Do you know how can i solve this problem? Tell me which log and configuration file do you needn to know. Thanks for help.