Arnt Gulbrandsen writes:
On Sunday 4 October 2020 11:49:29 CEST, Keith Moore wrote:
Please cite these "well established anti-abuse metrics" because they should
not be accepted as valid without question.
Actually, a significant set of email senders do question and do not accept
them, so you're in a lot of company here, even if it may not be very good
company ;)
But there's another aspect. Who accepts? These things are the content
of .procmailrc files and sieve scripts. Who has authority to accept or not
accept the validity of what I write in my sieve script? I believe that's a
local matter, out of scope for the IETF, and therefore off-topic for all
IETF lists.
Actually, this stuff is frequently checked during SMTP, and an undesirable
result results in a rejected EHLO, MAIL FROM, RCPT TO, or even DATA. The
original subject matter of this thread, the EHLO domain validation, is
rarely done in a post-receipt phase, like in .procmailrc.
But your question is equally valid: who has the authority to accept or not
accept the validity of how I configure my mail server with respect of the
criteria it uses to accept or reject public E-mail? And this seems to be on
topic, since the current document seems to require someone to accept the
validity of certain parts of SMTP, and prohibit those bits from being used
to determine that the E-mail is unwanted, and reject it.
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