Very strange error messages

[Stanier, Alan M]

Running MailScanner 4.30.3 under Debian Linux 2.2.24
I see messages in /var/log/mail.log ...

Jun 11 08:21:23 serlx15 MailScanner[14391]: SpamAssassin timed out and
was killed, failure -543 of 20 
Jun 11 08:58:48 serlx15 MailScanner[3929]: SpamAssassin timed out and
was killed, failure -25 of 20 
Jun 11 09:07:26 serlx15 MailScanner[3460]: SpamAssassin timed out and
was killed, failure 1 of 20 
Jun 11 09:19:24 serlx15 MailScanner[5028]: SpamAssassin timed out and
was killed, failure -31 of 20 
Jun 11 09:27:51 serlx15 MailScanner[32642]: SpamAssassin timed out and
was killed, failure -194 of 20 
Jun 11 09:33:38 serlx15 MailScanner[32642]: SpamAssassin timed out and
was killed, failure -211 of 20 
Jun 11 09:53:31 serlx15 MailScanner[8288]: SpamAssassin timed out and
was killed, failure -315 of 20 
Jun 11 09:58:26 serlx15 MailScanner[27284]: SpamAssassin timed out and
was killed, failure -244 of 20 

Does anyone know what is happening?

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