Creating a new sendmail mailer [with cutom limits]
http://www.brandonhutchinson.com/Creating_a_new_sendmail_mailer.html defining new sendmail ‘mailer’ with custom limits to create per-domain limit policy
http://www.brandonhutchinson.com/Creating_a_new_sendmail_mailer.html defining new sendmail ‘mailer’ with custom limits to create per-domain limit policy