I'm running a exim mail server + courier imap and squirrelmail on debian. The problem I have is that when I send a mail with squirrelmail I get the following message...
Requested action not taken: mailbox unavailable
Server replied: 550 relaying to <firstname.lastname@example.org> prohibited by administrator
But it work to send mail internaly to my other users... And I can send mails where ever using the "mail"-command...
Any ideas about this problem?