The End-To-End Internet (was Re: Blocking MX query)

Daniel Taylor dtaylor at
Tue Sep 4 16:34:43 UTC 2012

If you are sending direct SMTP on behalf of your domain from essentially 
random locations, how are we supposed to pick you out from spammers that 
do the same?

Use your MX or SPF senders as your outbound mail agent, especially if 
they are properly configured with full DNS records so we can tell they 
are the correct machines to be sending on your behalf, or expect that 
you will get more mail bounced and lost  than the average user because 
you are being unpredictable and unverifiable.

On 09/04/2012 11:05 AM, Jay Ashworth wrote:
> ----- Original Message -----
>> From: "John Peach" <john-nanog at>
>> On Tue, 4 Sep 2012 11:57:38 -0400 (EDT)
>> Jay Ashworth <jra at> wrote:
>>> SMTP Auth to *arbitrary remote domains' MX servers*? Am I missing
>>> something,
>>> or are you?
>> I run an MTA on my server and auth to that from laptops and other
>> clients. Relaying allowed for authorised users.
> So, in other words, it's ok to rant and stomp our feet about the end-to-end
> architecture and how critical it is to support in order to diss NAT, but
> we're required to ignore it when discussing SMTP?
> I'm not sure I'm following, there.
> Cheers,
> -- jra

Daniel Taylor             VP Operations       Vocal Laboratories, Inc
dtaylor at                                 952-941-6580x203

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