What group would you post this question?

[Galen Boyer]

I'm trying to diagnose why my wife can send emails with 4 email
addresses but 5 or greater she cannot.  I installed emacs on her system
and with gnus I also could only send an email with 4 emails and one with
5 emails did not go through.  Now, on my machine, I have no such issues.
Both my machine and my wife's machines are both contacting the same smtp
server.

I'm now trying to figure out what logging/server/whatever paths I need
to take to follow these email tests to see where they get stopped.

What group might be the most helpful?  I ask here because I'm pretty
sure alot here would know the low-level paths an email package might
take as it makes its way to the smtp server.

Thanks for any help.
-- 
Galen Boyer