Re: [Asrg] What are the IPs that sends mail for a domain?

John Levine <johnl@taugh.com> Mon, 22 June 2009 12:52 UTC

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Date: 22 Jun 2009 12:52:41 -0000
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From: John Levine <johnl@taugh.com>
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Subject: Re: [Asrg] What are the IPs that sends mail for a domain?
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>What about the other way around: given a domain and an IP address, can 
>we say whether the IP address "is a member of" the domain?

In a word, no.  SPF is the best effort we have along those lines, and
for reasons I hope I don't have to reiterate, it's far from adequate.

R's,
John