He's trying to spread his own spamtrap! giampaolo
> -----Messaggio originale----- > Da: Mark [mailto:[EMAIL PROTECTED] > Inviato: giovedì 19 ottobre 2006 23.46 > A: users@spamassassin.apache.org > Oggetto: RE: Scoring PTR's > > > > > -----Original Message----- > > From: John Rudd [mailto:[EMAIL PROTECTED] > > 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 >
