[Mailman-Users] mail delivery not consistent and very slow

[Jewel]

I recently upgraded my Mailman onto a new machine.  It appeared 
everything was running smoothly except now I have users saying they are 
posting and not seeing it come through.  All messages are successfully 
posting to the archives and I am seeing most messages get delivered but 
not 100%.  I have read the FAQ's and followed all of the suggestions 
without any errors:
http://wiki.list.org/pages/viewpage.action?pageId=4030722
http://tinyurl.com/6xrrju*

*My smtp-failure and error logs are not helping me determine what's 
wrong. Whenever I post a test to any list so far it always gets 
delivered. But I have a few users who said they have tried several times 
and don't see anything.  I had one woman try again this morning and can 
see it on the archive but not in my email -but other postings have been 
successful!!
 Please help me.  I have several members upset about the delay or lack 
of delivery and I can't find out what's going on.

Jewel