[rt-users] RT Emails Being Blocked by Various Providers

[Atro Tossavainen]

> To: Atro Tossavainen <atossava at cc.helsinki.fi>
> cc: rt-users at lists.bestpractical.com

No need to copy me personally, list only is just fine.

>> and that all entries should be valid, which seems really hard to grasp
>> to many ISPs
>
> And as such, it is indeed stupid to penalize their customers.
> To use PTR as one of many rules in spam analysis or grey-listing is
> reasonable, to flat-out deny SMTP is asinine.

It all depends on your point of view.  If you really feel the urge to
throw endless resources into analysing mail you knew far earlier you
would be rejecting anyway, be my guest.  Just don't expect everybody
else to do that.

If you thought mail from incompetently managed networks is best left
avoided, that's one data point you could use for making that judgement.

Some people figure accepting mail from zombie farms is a good idea,
too.  It all depends on what you, as the mail server owner, think is
a good idea.  I can't make that judgement for you, but as James Moseley
put it in this thread:

> Some mail environments are even more strict and require that the rDNS entry
> of the IP address match with the corresponding forward DNS record.

(Which is, perhaps not quite incidentally, in line with Section 2.1 of
 RFC 1912.)

> With that said, I think it's reasonable that an owner of a mail server
> sending legit email make sure that the IP address of their mail server
> have an rDNS entry.

Amen.

-- 
Atro Tossavainen (Mr.)               / The Institute of Biotechnology at
Systems Analyst, Techno-Amish &     / the University of Helsinki, Finland,
+358-9-19158939  UNIX Dinosaur     / employs me, but my opinions are my own.
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