[lug] Screwed up inbound email

[Paul Hardiman]

Hi,
As the subject implies, I have a slight problem at hardiman.com.
I have added a dsl router and updated my dns and MTA (exim).
I am getting a trickle of inbound email into hardiman.com, but not 
getting mailing list
traffic such as from this list (hence the alternate email account in the 
from line).
I check the router's port log and I see mostly dns (port 53) traffic, 
but verly little smtp (25).

I do have an MX record pointing to the MTA host, with port forwarding 
(smtp, et al) to the same host. However, the MX record is not visible 
outside my domain. Is this a problem?
If so, how does one proceed?
Is the MX record overkill for a small domain (1 zone)?

Appreciate any assist.

Regards,
Paul Hardiman
303-581-0006