ihug_rich (fowarded from ihug) wrote:
>
> 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.

I've run a lot of mail platforms, including some reasonably large ones
for ISPs, and this is the first I've ever heard of this.

If it were true, I'd expect to see 80+% of email being scored down as a
result of the source mailserver not being having a reverse DNS entry for
the envelope-from. This is not the case, so either you have encountered
some overly aggressive scoring platforms, or this is just incorrect.

> 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.

Again, I think this is unlikely, given the number of mail platforms
where outgoing mail is not handled by inbound mail.

> 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.

That is a risk.

Xtra's approach is a good one, and is about time they addressed it.
Many other large ISPs have had an identical system in place for years.
UUNET's UUDIAL platform has done this since 1999, for example. It is a
good thing, and I hope more ISPs implement it.

aj.

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