mail getting lost question

[Raul A. Gallegos]

Hi.  I'm not sure where to start troubleshooting the problem and am 
hoping someone can give some suggestions.

It appears that when sending mail to some places using my FC3 box that 
mail gets lost.  I do not receive any bounced message nor does the mail 
get received.  For my MUA I use mutt with fetchmail grabbing mail from 
my hosting service.  I was using exim as my mta with smarthost setup for 
outgoing mail which authenticated to my hosting service.  I tried 
sending a message to a mailing list on smartgroups and did not see it 
posted.  I was receiving mail just fine from the list and did confirm I 
was subscribed under the correct email address.  I then went to my 
Windows box using Outlook Express and sent a message to the smartgroups 
list and it went through.  The Outlook outgoing mail is set up to use my 
hosting service as it's smtp authenticator as well.  Basically the 
difference is that it did not go through my Linux MTA.

I thought for some reason the problem may have been exim so I switched 
it to using postfix.  Configured it to authenticate outgoing mail to my 
hosting service and still get the same results.  So far I've mainly 
noticed this with the smartgroups.com domain but a few others have told 
me they have not received mail from me when I know I sent out messages.

The logs of exim or postfix show the message went out successfully.  
Either that or I am not sure of what to look for exactly.

Any ideas?