Problem with scanning mail

[A&M ImpacT [T. Suter]]

My Mailscanner configuration doesn't seen to scan mail properly with clamav.


It kept saying:  
Unscanned: Delivered 1 messages

When I switch to debug mode mailscanner tells me:
Dec  9 11:02:27 localhost MailScanner[1029]: New Batch: Forwarding 1
unscanned messages, 16729 bytes
Dec  9 11:02:27 localhost MailScanner[1029]: Spam Checks: Starting
Dec  9 11:02:29 localhost MailScanner[1029]: SpamAssassin returned 0
Dec  9 11:02:29 localhost MailScanner[1029]: About to deliver 1 messages
Dec  9 11:02:29 localhost MailScanner[1029]: Unscanned: Delivered 1 messages
Dec  9 11:02:29 localhost MailScanner[1029]: Created attachment dirs for 0
messages
Dec  9 11:02:29 localhost MailScanner[1029]: Virus and Content Scanning:
Starting
Dec  9 11:02:29 localhost MailScanner[1029]: Commencing scanning by
clamav...

The spam checks go ok, but somehow things get messed up after this. It
doesn't scan any mail. It sais: Created attachment dirs for 0 messages. That
sounds strange to me.

I'm using Mailscanner 4.22 (I know it is old, but I need to stick to this
one)
Clamav version 0.87

I hope that anyone can help. Searching the web didn't brought me a solution.

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