|For several years, the Parallels Plesk Panel, running Postfix, has been plagued with a problem where the server suddently starts
sending out a rather useless error message: – Props to EdwardG
My observations indicate that this is coming from the Postfix “Before Queue Filter.”
I removed the before-filter from one of my servers, and one of the messages that had been retrying over and over again then delivered. I was able to get a look at it. What I saw was a little message with a binary mime attachment, clearly spam or malware. The content-filter was quite right in refusing it.
This would be cured if the postfix-queue program would return a 500 series error on the message. After all, the content filter isn’t going to accept it next time around, so why retry it.
Anyway, the only solution that I see for us at the system administration level, is to remove the before-content-filter. This is accomplished by editing /etc/postfix/master.cf as follows:
Find this line: smtp inet n – - – - smtpd -o smtpd_proxy_filter=127.0.0.1:10025
Then restart postfix with /etc/init.d/postfix restart (or similar) reload
Archive for July, 2011
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