[PLUG] Finding where incoming e-mail is lost

[Rich Shepard]

On Thu, 6 Jul 2017, Jim Garrison wrote:

> Those are the IPs of the website, not the outgoing SMTP server.  There's
> no reliable way to find out how a domain SENDS email. You can query DNS
> for the MX record to see where they RECEIVE email but not for the outgoing
> server. With an organization like CC they likely have dozens or hundreds
> of outgoing SMTP servers.

Jim,

   True that.

> If you blocked them based on an RBL, you would see log entries to that
> effect (but they wouldn't show the website addresses). However, if they
> are RFC compliant then the reverse IP for the servers SHOULD map back to
> their domain(s), so try grepping the log for 'const' and 'conta'

   Aha! Found it using const rather than constantcontact.com. That was
rejected years ago when I received too much spam from them.

Thanks very much for pointing me to the solution,

Rich