Exchange 2010 SP1.
By default when a machine goes outbound to send mail it appears to be using
{hostname}.{AD domain} as the second parameter to HELO/EHLO. I see that you can
set this on a per send connector basis but can it be set to a variable? Such as
$hostname.$someotherdomain.
So, hub/transport 1, call it HT1 with IP address 1.1.1.1, goes out and after it
gets the 220 banner it says:
EHLO ht1.internal.ad.com
(say internal.ad.com is our AD domain)
Then when the remote does a reverse lookup on 1.1.1.1 it doesn't get
ht1.internal.ad.com
Now, I don't control the name servers that resolve the 1.1.1.1 name however I
can get names in it... So I add names like ht1.ad.com. Then, when 2010 goes
out it would issue:
EHLO ht1.ad.com
Which would resolve. From time to time I've run into really picky mail server
that *must* have the HELO/EHLO response reverse DNS correctly.
In 2003 we could do just this however in 2010 it appears to be only at the
connector level and not at the host level. $hostname in the connector setting
would be nice.
Darren Young
Systems & Security Architect
Computing Services
University of Chicago
Booth School of Business
5807 South Woodlawn Avenue
Chicago, IL 60637
Voice 773.702.0331 | Fax 773.702.0233
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