>Thanks for your analysis of the header information. Interesting (or oddly)
>enough, most of our messages have the IP 127.0.0.1 in the first Received
>line. Could this be a fault in my setup of IMail or our server OS (SBS 2000
>with ISA Server using the Firewall and Proxy Server)?
Having the 127.0.0.1 in the Received: header of your E-mail means that
IMail received the E-mail from something else on the local server. If the
firewall or proxy server caused that, they are broken (unless they are
running on the IMail server).
However:
>Scott, this is the header information I show for you:
>
>Received: from list.ipswitch.com [127.0.0.1] by tonerworld.com with ESMTP
> (SMTPD32-7.07) id A560BF01BA; Fri, 07 Jun 2002 14:28:00 -0700
Something is broken. list.ipswitch.com is *not* 127.0.0.1. You have
something running that is passing on the name of the remote mailserver, but
not recording its IP. That's not good. There is no way to track down
spammers that way, and there is no way to use IMail's anti-relay settings
(although whatever is causing the odd behavior might have its own
anti-relay settings).
Do you have IMail set to listen on a port other than the standard SMTP port
25? That would indicate that you have some sort of software running to
interfere with the connection, which would at least mean that the software
was partially behaving. But if it is going to break the IP address, it
should at least add its own Received: header to include the correct IP
address (as SMTP-based virus scanners will normally do).
I can't think of any way that this could happen, without requiring you to
change the IMail SMTP port.
-Scott
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