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Re: [ietf-smtp] EHLO domain validation requirement in RFC 5321

2020-09-27 11:29:46
On 9/27/2020 8:33 AM, Keith Moore wrote:

On 9/27/20 11:04 AM, John R Levine wrote:

Anything that comes from a dynamic or NAT pool is invariably spam from a botnet.

No, because nobody is looking that closely.   It's basically just prejudice that assumes that "legitimate" senders have static IP addresses, delegation of the corresponding zone in, and the knowledge to populate the PTR records.

John L. has been correctly summarizing what members of M3AAWG have been quite consistent about, for many years.  It is part of the reason that running a legitimate mail server on the open Internet, these days, requires a significant amount of knowledge about the rather elaborate set of expected configuration and procedure.

Properly registering the domain name and the IP address, forward and backwards, has been one of the more basic and practical requirements for at least 10 years, that I know of, but probably a lot longer.

As for 'prejudice', I encourage folk to spend some time around the anti-abuse industry and learn more about how it operates, since it takes a 95% spam level for incoming mail and brings in down to a tiny percent.


Dave Crocker
Brandenburg InternetWorking

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