I got it! (Was: R: Scoring PTR's)

[Giampaolo Tomassoni <g....@libero.it>]

He's trying to spread his own spamtrap!

giampaolo

> -----Messaggio originale-----
> Da: Mark [mailto:admin@asarian-host.net]
> Inviato: giovedì 19 ottobre 2006 23.46
> A: users@spamassassin.apache.org
> Oggetto: RE: Scoring PTR's
> 
> 
> 
> > -----Original Message-----
> > From: John Rudd [mailto:jrudd@ucsc.edu]
> > Sent: donderdag 19 oktober 2006 22:49
> > To: Mark
> > Cc: users@spamassassin.apache.org
> > Subject: Re: Scoring PTR's
> >
> > 
> 
> > >>> I setup mail servers all the time and I always make sure the
> > >>> Mail server broadcast name, the 'A' record and the PTR all
> > >>> match, IT IS JUST GOOD PRACTICE.
> > >
> > > No, it's NOT good practice. Seriously. Without battering
> > > the point, it's> really perfectly legit for an MTA to use different
> > > HELO names (say, based on hosting of virtual servers), whilst the
> > > IP address for that MTA has a "fixed" PTR.
> >
> > The statement you're replying to doesn't say anything about the HELO
> > string.
> 
> Oh? The OP's example was:
> 
> cirencester.co.uk (c204131.adsl.hansenet.de [213.39.204.131])
> 
> Here, "cirencester.co.uk" is the HELO name; and "c204131.adsl.hansenet.de"
> the PTR. Similarly, in the line:
> 
> Received: from mail.apache.org (hermes.apache.org [209.237.227.199])
> 
> "mail.apache.org" was the supplied HELO name, whereas the connecting IP
> address resolves to "hermes.apache.org".
> 
> > ... It says the PTR and A records should match (and they SHOULD).
> 
> Oh? An IP address lookup will give you a single PTR; but many domains can
> be registered in DNS with the same IP address, of course. An A record
> lookup for "mail.apache.org" resolves to 209.237.227.199; whereas the
> 199.227.237.209.in-addr.arpa query (PTR) gives you "hermes.apache.org".
> This is neither an error, nor wrong in any other way.
> 
> Besides, what do you mean by an A record in the context of a mail
> exchanger anyway? The A record of the HELO name? Or an A record for the
> PTR? The A record for "hermes.apache.org" (PTR) resolves nicely to
> 209.237.227.199. But it doesn't have to. For instance, in the case of
> microsoft.com and yahoo.com there are multiple A records (done for load
> balancing?). And you will get them returned in random order. Exit "PTR and
> A records should match".
> 
> - Mark
>