Not often I post

Karl Bailey karl.bailey at
Thu Mar 30 23:02:24 IST 2006

Only when I have a problem, which I seem to at the moment. Two day in a
row now I have had a problem with MailScanner 4.51.5-1 running in RedHat
FC1. It employs spam assassin, kaspersky, f-prot & mcafee virus
scanning. CPU usage etc hovers around 25% & all in all it works very
well processing around 20000 messages (6GBytes) a day.


I have received a single message that brings mailscanner to it's knees
.. the message enters the inbound mail queue, the MailScanner processes
defunct one by one till MailScanner is effectively not processing mail
any more, mail builds up in the inbound mail queue. This is exasperated
by the fact that although MailScanner reports as defunct in the process
list it is actually still identifying spam, & generating spam warning
messages, which in turn end up in the inbound queue... this seems to
lead to a "DOS" effect. 


I have isolated the single message in it's raw queue qf & df files.
Every time I place it into the inbound queue the processes defunct, &
yes I am ensuring there is no file permissions problems... If anyone
wants a copy of the message I can send them the queue files.... I'm
suspicious though that the Virus Scanning is where the problem lies,
hence without the combination of VC's listed above it may run through
the queue ... Any ideas? The one thing I've noticed about the header (qf
file) is that there seems to be some very long boundary strings emplyed.




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