OT: Be sure your rDNS is in place...

[Fairlight]

At Mon, Jun 28, 2004 at 12:05:50AM -0400 or thereabouts, 
suspect John Esak was observed uttering:
> says they will do this in their contract, but they didn't! So for about two
> and half years I've been running and periodically getting (but really very
> rarely) email sent back because the reverse DNS was not there. I kind of

If you've been doing that for 2.5 years and are first seeing results like
that now, you've been very lucky indeed.  IgLou, for instance, has been
doing that for years.  I think it's been at least two years since most
vendors started shipping linux platforms with sendmail configured to reject
on no rDNS.  I think exim always has been set that way, though that's a
hazy memory.

Suffice it to say, it's been going on for a long time and some places are
now playing catch-up.

Now what -has- gotten more stringent is that you used to be able to just
have a PTR for your IP# that pointed to -any- valid hostname.  As long as
it could be looked up, it was accepted.  I could set up a client site and
make the PTR for an IP# point to any of their valid A record hostnames.
Used to do that when masquerading.

This is no longer the case.  In the last year, software and institutions
have increasingly clamped down on that, and you have to match the A and PTR
records or it goes *poof*.

mark->
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