Stuff…

Looking to move back to qmail from postfix due to all the issues introduced by Plesk when using Postfix.  Unfortunately Parallels have produced an extremely flaky implementation of the Postfix MTA in their Plesk 9.x control panel software and have not been able to fix the bugs in months.

The following article describes the process of switching between MTAs in Plesk 9.

• http://kb.parallels.com/en/5801

Some of the problems discovered when using Postfix under Plesk 9.x:

• Postfix segfaults upon postfix-queue execution when processes message with strings of more than 4096 characters

/usr/local/psa/var/log/maillog
—>8—
May 22 16:43:42 server1 postfix/spawn[11899]: warning: command /usr/lib/plesk-9.0/postfix-queue killed by signal 11
May 22 16:43:42 server1 postfix/spawn[11901]: warning: command /usr/lib/plesk-9.0/postfix-queue exit status 255
—8<—

• Postfix still sending hundreds ‘queue file write error’ (This thread appears to be the mail postfix issue thread on their forum)

Nov 19 00:14:05 srv03 before-queue[21718]: Unprocessed command:
Nov 18 16:14:05 srv03 postfix/smtpd[21595]: lost connection after DATA from unknown[127.0.0.1]
Nov 18 16:14:05 srv03 postfix/smtpd[21595]: disconnect from unknown[127.0.0.1]
Nov 18 16:14:05 srv03 postfix/smtpd[21651]: warning: lost connection with proxy 127.0.0.1:10025

Nov 3 13:47:52 cgn8 before-remote[16362]: Unprocessed command: received:
Nov 3 13:47:52 cgn8 before-remote[16362]: Unprocessed command: from:
Nov 3 13:47:52 cgn8 before-remote[16362]: Unprocessed command: subject:
Nov 3 13:47:52 cgn8 before-remote[16362]: Unprocessed command: content-type:

• [HOTFIX] Postfix cannot send e-mails with attachments (apparently fixed, but isn’t, in Plesk 9.3)

Dec 18 18:28:45 plesk before-queue[1331]: handlers_stderr: PASS
Dec 18 18:28:45 plesk before-queue[1331]: errno: Broken pipe
Dec 18 18:28:45 plesk before-queue[1331]: System error: Broken pipe
Dec 18 18:28:45 plesk before-queue[1331]: Unable to write data to stream
Dec 18 18:28:45 plesk before-queue[1331]: Some error occured
Dec 18 18:28:45 plesk postfix/spawn[919]: warning: command /usr/lib64/plesk-9.0/postfix-queue exit status 255

There are many more threads and articles about this, but, not going to list them all here.

Over at http://se.id.au/journal/files/plesk_postfix_queue_file_write_error.php it is suggested that if you bypass the plesk proxy_filter implementation you can get rid of a lot of these problems… however, you loose spam filtering and other options at the same time.