Process did not exit cleanly, returned 255 with signal 0

[Ray Dermody]

Hi Guys,
I am running RH9 , Sendmail-8.12.8-9.90 and MailScanner-4.26.8-1.
I had sendmail running fine and it was running as my mail server without any problems.
I then uninstalled MailScanner but now all my mails are getting stuck in
/var/spool/mqueue.in/
In the /var/log/message file I see the following being repeated consistently

Feb  6 11:18:32 mailtest root: Process did not exit cleanly, returned 255 with signal 0
Feb  6 11:19:13 mailtest last message repeated 4 times
Feb  6 11:20:23 mailtest last message repeated 7 times
Feb  6 11:21:33 mailtest last message repeated 7 times
Feb  6 11:22:43 mailtest last message repeated 7 times
Feb  6 11:23:54 mailtest last message repeated 7 times

Can anybody point me in the right direction?.
Many thanks.
Ray.