entourage, exchange, and NUMERIC_HELO

L

lchism

I work in a mixed-OS office where some users are on XP & Outlook, and
some are on OS X & Entourage. We use a hosted Exchange provider.

The issue is that the mail coming from Entourage has an additional
"Recieved: from...." header that shows our office IP address and no
resolved name. Spam Assassin is giving us points for responding to HELO
with a number and not a name. We are using private IP addresses behind
a NATing firewall, and the IP that is showing up is the external IP of
the office, not the interal IPs. Entourage is configured to use the
Exchange host as an exchange host (not IMAP or POP), and there are no
servers in the config other than the provider's servers. Our internal
firewall is setup such that port 25 is inaccessible from the outside.

The mail from Outlook to Exchange coming from users in the same office
does not have that last "Received: from" header and thus is not getting
flagged by spam assassin.

My searches have not turned up any help.

Any tips, pointers, or ideas would be very appreciated.
 

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