Plesk Queue File Write Error
One of the most anticipated features in Plesk 9 for me was the option to select Postfix instead of Qmail, and I did it as soon as I upgraded my own server to Plesk 9.
However, from time to time I would receive an error message email from Postfix indicating that one of my messages was not delivered, such as the following:
Out: 220 servername ESMTP Postfix In: EHLO hostname Out: 250-servername Out: 250-PIPELINING Out: 250-SIZE 102400000 Out: 250-VRFY Out: 250-ETRN Out: 250-STARTTLS Out: 250-AUTH LOGIN CRAM-MD5 PLAIN DIGEST-MD5 Out: 250-ENHANCEDSTATUSCODES Out: 250-8BITMIME Out: 250 DSN In: MAIL FROM: SIZE=3368 Out: 250 2.1.0 Ok In: RCPT TO: Out: 250 2.1.5 Ok In: DATA Out: 354 End data with . Out: 451 4.3.0 Error: queue file write error In: QUIT Out: 221 2.0.0 Bye
There would also be an error message in the Plesk mail log such as:
The Plesk knowledgebase article says that this issue will be fixed in a future release of Plesk and to change back to Qmail, something I didn’t want to do so I set about finding a workaround of my own.
I discovered that by changing one line in /etc/postfix/master.cf from:
stops the error messages and allows those messages to be delivered.
Doing this breaks some features like spam filtering, but as my server sits behind an IronPort email security appliance for mail all messages are filtered prior to delivery anyway so this was a compromise I could live with.