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problem, mailscanner stops


I'm runnning a mail server on debian sarge, postfix 2.1.5-9, mailscanner 4.41.3-2, spamassassin 3.0.3-2 and clamav volatile.
The load is about 5000 mails a day.
This has been working perfectly for months until this week.
Mailscanner seems to stop scanning postfixs HOLD queue. All processes - postfixs as well as mailscanner etc - are running, but no mail is transported from the HOLD queue which just grows. All other postfix queues are processed. The problem thus seems to be in mailscanner. Restarting postfix reveals an error stating that a "bogus file" is in the HOLD queue directories. Inspecting the file reveals it is a mail attachement(!!), that's thus is located in postfixs HOLD queue directory! At all times the attachment has been of the form tnef-<number>-1.doc, and thus seems to be a outlook/outlook express attachement.

But why and how has the file been copied into postfixs HOLD queue?
I can't find anything relevant in the log files (see below).

Inspecting the log files reveals:
a) the message id associated with the mail is much longer than normal - about 430 bytes. Probably not the problem
b) the following:
May 19 17:25:17 mail MailScanner[13342]: Expanding TNEF archive at /var/spool/MailScanner/incoming/13342/7C87619D19.0F598/winmail.dat May 19 17:25:17 mail MailScanner[13342]: Corrupt TNEF winmail.dat that cannot be analysed in message 7C87619D19.0F598 May 19 17:25:17 mail MailScanner[13342]: Virus and Content Scanning: Starting May 19 17:25:18 mail MailScanner[13342]: /var/spool/MailScanner/incoming/13342/./7C87619D19.0F598/winmail.dat: Input/Output error May 19 17:25:18 mail MailScanner[13342]: ProcessClamAVOutput: unrecognised line "/var/spool/MailScanner/incoming/13342/./7C87619D19.0F598/wi
nmail.dat: Input/Output error". Please contact the authors!

Thank you!
/Erik Persson

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