It doesn't count as invalid, but the reverse of that situation where the
source smtps reverse dns domain being the same as the domain that the mail
is from has a helpful effect on the mail getting thru when its weak in other
areas.

Likewise if the MX of the sender points back to the same machine, it goes
along way to automatedly (is that even a word) determining that the sender
is indeed correct. All of these have positive weightings and you need all
you can get with how aggressive some spam filters are these days.

Ive thought of another downside to using the xtra mail servers, in that they
will get any spamcop etc complaints to deal with, not me, so that means they
will most likely just do what they do whenever a clients machine is
compromised (turn off the connection or whatever) on invalid complaints.

-----Original Message-----
From: owner-adsl@unixathome.org [mailto:owner-adsl@unixathome.org] On Behalf
Of Mark Foster
Sent: Tuesday, April 04, 2006 11:49 AM
To: adsl@lists.unixathome.org
Subject: RE: Xtra to close 25/TCP Outbound...

> The concept of a domain being hosted _by_ an ISP is universal, but
> people who own their own domains and have them hosted by their
> provider don't likewise expect a dns entry for their domain to point
> at their ISPs mail network.

Should clarify, i intended to say that there would not necessarily be an
address in your zone file that points to an ISP mail server.

eg.

if xyz.co.nz was hosted at Xtra,

the xyz.co.nz zone file would probably have

@ IN MX 20 mta.xtra.co.nz.

within its zone file.

The query 'XYZ.CO.NZ MX'

is going to get

20 MTA.XTRA.CO.NZ

as a response. Theres nothing wrong or invalid in that, and ive never
heard of this counting as a score toward a 'spam' markup...

Mark.

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