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Re: FORMS, validating mail was sent [message #181948 is a reply to message #181931]

Thu, 27 June 2013 15:57

gordonb.htsnc
Messages: 1
Registered: June 2013

Karma:

Junior Member

> Utter nonsense. An (standards-compliant) “MX” or “A” DNS record *never*
> points to 127.0.0.1. In particular, an MX record never has an IP address as
> its value, as I have already pointed out.

You expect spammers, vandals, and viruses to generate standards-compliant
DNS? Or standards-compliant *anything*? Wow, I thought that kind
of gullibility died out eons ago.

Standards consist mostly of things *YOU* are responsible for checking,
and a checklist of things for spammers, vandals, and viruses to try
breaking to see if they can bypass any filters that way. That may
not be the purpose the standards writers intended, but they are
often used that way anyway.

An MX record is not supposed to have an IP address as it's value,
but there is a good chance that if it does (for the destination
address) a good fraction of the mail will be delivered anyway. When
was the last time you tested whatever MTA you use to see if it will
use such an address? Some accept it, some don't, and some have an
option. ISPs using the software with an option may discover that
allowing it anyway reduces customer complaints. ("Why can't I send
mail to fubar.com through you? It works from AOL.")

I don't think there are any places in email standards that require
delivery of mail to fail due to an IP address in a MX record. In
any case, anti-SPAM rules often trump situations where the standards
say mail should be delivered.

> 127.0.0.1 is specified at most in the local host file, and resolving a

There's nothing wrong with including "localhost" in a nameserver for
a local LAN.

> domain name of a supposed e-mail address will *never* result in 127.0.0.1.

You're wrong, unless you're going to use the "(standards-compliant)"
dodge. Some people don't know you shouldn't put IP addresses in
MX records, especially those where it seems to work. Others use
off-in-the-weeds IP addresses to ignore bounce messages from their
mailing lists, something I think violates a reasonable anti-SPAM
policy - they are ignoring requests for removal from the list.
Others use wrongly-pointed MX records to direct distributed attacks.

As to DNS servers not responding: there are 13 root server names
and at various times I've seen them all individually (so I know
it's not just my ISP off the net) fail to respond. Sometimes there
were announced outages.

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[Message index]

		FORMS, validating mail was sent By: bill on Thu, 20 June 2013 17:40
		Re: FORMS, validating mail was sent By: Jerry Stuckle on Thu, 20 June 2013 17:53
		Re: FORMS, validating mail was sent By: J.O. Aho on Thu, 20 June 2013 18:18
		Re: FORMS, validating mail was sent By: The Natural Philosoph on Thu, 20 June 2013 18:24
		Re: FORMS, validating mail was sent By: Jerry Stuckle on Thu, 20 June 2013 18:40
		Re: FORMS, validating mail was sent By: gordonb.vb4vo on Thu, 20 June 2013 19:44
		Re: FORMS, validating mail was sent By: The Natural Philosoph on Thu, 20 June 2013 21:03
		Re: FORMS, validating mail was sent By: bill on Fri, 21 June 2013 18:06
		Re: FORMS, validating mail was sent By: bill on Sat, 22 June 2013 15:42
		Re: FORMS, validating mail was sent By: Thomas 'PointedEars' on Sun, 23 June 2013 11:13
		Re: FORMS, validating mail was sent By: The Natural Philosoph on Sun, 23 June 2013 11:22
		Re: FORMS, validating mail was sent By: bill on Sun, 23 June 2013 17:07
		Re: FORMS, validating mail was sent By: bill on Sun, 23 June 2013 17:00
		Re: FORMS, validating mail was sent By: J.O. Aho on Sun, 23 June 2013 18:22
		Re: FORMS, validating mail was sent By: bill on Sun, 23 June 2013 18:53
		Re: FORMS, validating mail was sent By: gordonb.4qaft on Mon, 24 June 2013 19:43
		Re: FORMS, validating mail was sent By: Peter H. Coffin on Mon, 24 June 2013 20:09
		Re: FORMS, validating mail was sent By: Thomas 'PointedEars' on Tue, 25 June 2013 13:19
		Re: FORMS, validating mail was sent By: Jerry Stuckle on Tue, 25 June 2013 14:11
		Re: FORMS, validating mail was sent By: bill on Tue, 25 June 2013 15:43
		Re: FORMS, validating mail was sent By: bill on Tue, 25 June 2013 15:32
		Re: FORMS, validating mail was sent By: gordonb.htsnc on Thu, 27 June 2013 15:57
		Re: FORMS, validating mail was sent By: Thomas 'PointedEars' on Thu, 27 June 2013 19:13
		Re: FORMS, validating mail was sent By: Arno Welzel on Fri, 28 June 2013 09:43
		Re: FORMS, validating mail was sent By: gordonb.k0cb7 on Thu, 20 June 2013 20:46
		Re: FORMS, validating mail was sent By: Jerry Stuckle on Thu, 20 June 2013 21:03
		Re: FORMS, validating mail was sent By: gordonb.udxst on Sat, 22 June 2013 00:26
		Re: FORMS, validating mail was sent By: Jerry Stuckle on Sat, 22 June 2013 00:36
		Re: FORMS, validating mail was sent By: bill on Sat, 22 June 2013 16:04
		Re: FORMS, validating mail was sent By: Christoph Michael Bec on Thu, 20 June 2013 21:39
		Re: FORMS, validating mail was sent By: Tim Streater on Fri, 21 June 2013 09:11
		Re: FORMS, validating mail was sent By: The Natural Philosoph on Fri, 21 June 2013 10:25
		Re: FORMS, validating mail was sent By: Tim Streater on Fri, 21 June 2013 11:27
		Re: FORMS, validating mail was sent By: The Natural Philosoph on Fri, 21 June 2013 16:59
		Re: FORMS, validating mail was sent By: Tim Streater on Fri, 21 June 2013 17:25
		Re: FORMS, validating mail was sent By: The Natural Philosoph on Fri, 21 June 2013 22:43
		Re: FORMS, validating mail was sent By: Tim Streater on Sat, 22 June 2013 12:45
		Re: FORMS, validating mail was sent By: bill on Sat, 22 June 2013 16:20
		Re: FORMS, validating mail was sent By: Peter H. Coffin on Thu, 20 June 2013 22:27
		Re: FORMS, validating mail was sent By: The Natural Philosoph on Fri, 21 June 2013 06:57
		Re: FORMS, validating mail was sent By: bill on Sat, 22 June 2013 16:02
		Re: FORMS, validating mail was sent By: GravyCode on Fri, 21 June 2013 18:30

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