Well the mailman faq says to turn off synch DNS resolution.

Time for the sendmail book.

-- 
Bob Tanner <tanner at real-time.com>       | Phone : (612)943-8700
http://www.mn-linux.org                 | Fax   : (612)943-8500
Key fingerprint =  6C E9 51 4F D5 3E 4C 66 62 A9 10 E5 35 85 39 D9