Cron program that runs every minute..is it needed ?

Hello This appears in my system log every minute. Aug 13 10:27:00 buffy /USR/SBIN/CRON[2403]: (mdom) CMD (/usr/bin/python -S /usr/lib/mailman/cron/qrunner) This is caused by an entry in /usr/lib/mailman/cron/crontab.in # Retry failed deliveries once per minute. * * * * * /usr/bin/python -S /usr/lib/mailman/cron/qrunner What exactly is it trying to do ? Retrying failed deliveries of what exactly ? Is it needed ? Thanks Cliff