Exim acting odd

[J[ISO-8859-1] ørgen Giversen]

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Dear all
This evening our mail sever started to write this in the messages log
Aug 16 21:39:44 mail-web exim: Process did not exit cleanly, returned 13
with signal 0
........
Aug 16 23:00:09 mail-web exim: Process did not exit cleanly, returned 13
with signal 0
Aug 16 23:00:20 mail-web exim: Process did not exit cleanly, returned 13
with signal 0
Aug 16 23:00:31 mail-web exim: Process did not exit cleanly, returned 13
with signal 0
Aug 16 23:01:09 mail-web exim: Process did not exit cleanly, returned 13
with signal 0
and it continues
In /tmp it genereates a lot of empty folders named
tnef.5595
tnef.5614
tnef.5655
tnef.5675
.......
owned by exim
any ideas whats going on

OS: RHEL4
MTA: exim 4.43
Mailscanner: 4.44.6-2
spamassassin: 3.0.4-1

Best regards
Jørgen Giversen 

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