sendmail mqueu-client remaining files

Hello there
I have a question concerning sendmail and it's MSP functionality on Debian.
I'm running a mail server with MTA running as daemon and MSP running as
cronjob.
My /var/spool/mqueue-client looks like this:
-rw-rw---- 1 smmsp smmsp 229 2008-09-12 05:09 dfm8C39JIw008052
-rw-rw---- 1 smmsp smmsp 2147483647 2009-06-19 14:59 dfn5JCo1AO015780
-rw-rw---- 1 smmsp smmsp 2147483647 2009-06-19 15:11 dfn5JD02BS009581
-rw-rw---- 1 smmsp smmsp 2147483647 2009-06-19 15:19 dfn5JDA256032527
-rw-rw---- 1 smmsp smmsp 2147483647 2009-06-19 15:29 dfn5JDK1jW023879
That takes about 8 Gigs of space! But at the same time the MSP queue is
said to be empty:
hosting:~# sendmail -Ac -bp
/var/spool/mqueue-client is empty
Total requests: 0
How can this be?
Where these files maybe left over from a crash? Can i remove them now by
hand without getting into troubles?
Any help would be much appreciated!
TW
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