What are those lines in the crontab listing doing?

I noticed today 4 lines which are present in the crontab listing on one of my servers while they are not on others of my servers:

0 6 * * * /usr/sbin/exim_tidydb /var/spool/exim callout > /dev/null 2<&1
0 6 * * * /usr/sbin/exim_tidydb /var/spool/exim retry > /dev/null 2<&1
0 6 * * * /usr/sbin/exim_tidydb /var/spool/exim reject > /dev/null 2<&1
0 6 * * * /usr/sbin/exim_tidydb /var/spool/exim wait-remote_smtp > /dev/null 2<&1

I can see that it is something with exim, but what is it that are happening? Hoping for some input.

Thanks
John

 

 

 

 

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