[PLUG] Finding where incoming e-mail is lost

[Rich Shepard]

   I'd like network admin help in trying to find where an expected e-mail
message gets lost before arriving here.

   Each Tuesday evening an association's newsletter is distributed by the
marketing service Constant Contact (constantcontact.com) using the domain
name conta.cc. It does not arrive here. A week or so ago I both
re-subscribed via their web site and sent them a message using their web
site form without any response. Today I tried to find where it might fall
off the rails.

   When I asked whois 'constantcontact.com' I received a long report which
did not include an IP address. Interesting. A web search for 'find IP
address from domain name' returned a site that provided the numbers:
 	constantcontact.com	208.75.122.14
 	conta.cc		67.199.248.12 and 67.199.248.13

   I searched all five maillogs for those IP addresses as well as for the
domain name conta.cc and found nothing. This suggests to me that the
messages don't arrive here to be processed by postfix (version 3.2.2) and
might be trapped by a RBL which postfix checks and, apparently, no other
subscriber does.

   Is there anything else I can do to learn why the association's newsletters
do not arrive here each week?

Rich