If you want to delete old message logs of the
mailer app simple use:
You can also add the command to your cronjobs:
0 4 * * 4 $HOME/bin/django-cleanup-mailer-messagelog.sh > $HOME/mylogs/cron/django-cleanup-mailer-messagelog.log 2>&1
Logs younger than 122 days (~4 months) will be ignored, logs older than 122 days will be deleted.