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Spawnsworth 21st June 2012 13:33

Squirrelmail - SMTP problems
Hi all, hope someone can help with this.

We are an ISP running a POP3 and an IMAP server, both running Debian 5.0.3. One of our domains '' has several email accounts, some of them POP3 and some of them IMAP. ( (

Squirrelmail is installed on the IMAP server, and when '' (IMAP) tries to send an email to '' (POP3) they get the following error:

"Requested action not taken: mailbox unavailable
Server replied: 550 5.1.1 <>: Recipient address rejected: User unknown in virtual mailbox table"

Now, this would be happening as the 'office@' user is on the POP3 server which is external. But as there are other email accounts for '' on this IMAP server, it is looking for that in the mailbox table and seeing that it doesn't exist, hence throwing up the above error.

I have tried to force squirrelmail/postfix to use an external relay server but it still appears to be sending through local host.

I have edited relayhost in and Squirrelmail config.php but to no avail. It still doesn't seem to be working.

Can someone please help with this? Please let me know if you need any more info.


falko 22nd June 2012 15:44

You would need to remove from mydestination in /etc/postfix/ or create a transport that forwards emails for to the other server. See

man 5 transport

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