[Mailman-Users] How to check mailman on successfully hand off the message?

[Hung Phan]

Hello, folks

We have about two dozens of lists set to confirm subscription. All  
lists are working except one. Somehow the confirmation email never get  
to the users even though, the smtp log indicates that Mailman  
dispatches a message for each subscription.

Jan 06 16:14:51 2010 (2305) <mailman.0.1262823290.13100.chs_parents at mailman.server.address 
 > smtp to chs_parents for 1 recips, completed in 0.067 seconds
Jan 06 16:17:29 2010 (2305) <mailman.0.1262823448.13144.chs_parents at mailman.server.address 
 > smtp to chs_parents for 1 recips, completed in 0.072 seconds
Jan 06 16:19:40 2010 (2305) <mailman.0.1262823579.13186.chs_parents at mailman.server.address 
 > smtp to chs_parents for 1 recips, completed in 0.070 seconds
Jan 06 16:23:39 2010 (2305) <mailman.0.1262823817.13285.chs_parents at mailman.server.address 
 > smtp to chs_parents for 1 recips, completed in 0.066 seconds

On the recipient side, the ISP could not find any trace of the  
messages being delivered to their email server. They ask us to check  
whether the messages were successfully hand-off. Beside from the smtp  
log, any other log that may indicates the messages were successfully  
sent out?

Our Mailman is hosted on Fedora 10, Mailman 2.1.12, Exim 4.69-7

Any advice is very appreciate for the newbie :)