4.10 Is there a good log analysis tool for Postfix?

Yes indeed! It's a Perl script called pflogsumm.pl written by James S. Seymour. The URL is:

http://jimsun.linxnet.com/postfix_contrib.html

You could then run this as a cronjob like so:

   crontab -e
   
   0 2 * * * /path/to/pflogsumm.pl -d today /var/log/maillog | mail -s "Mail Report" you@somewhere.com