On Tue 11/Feb/2020 03:45:58 +0100 John Levine wrote:
In article
<CAO=DXp-j4OFwiPqLHvNzQ+dL+CNE0t58AZ33pxaBkBBWce2+NA(_at_)mail(_dot_)gmail(_dot_)com>,
George Schlossnagle <george(_at_)sparkpost(_dot_)com> wrote:
We see a good bit of email here and the number of 551s that seem to
indicate forwarding is being suggested is incredibly tiny. I could run
some stats if you like, but call it < 0.0002% over the past year's bounces.
Thanks. Do you see any 251 at all?
251's cannot be seen, except in the mail log. While "551 send to <x>" is
manually actionable by the author who receives the bounce, 251 is not, unless
someone enables positive delivery notification.
FWIW, in my tiny log files I found a few improper replies like the following,
in the period September-December 2014:
551 5.0.0 This message was classified as spam
and no 251 at all.
Using Courier-MTA, I'd have to devise a new add-on in order to issue these
responses using configured forward addresses. Do Sendmail or Postfix provide
for email address portability?
Best
Ale
--
_______________________________________________
ietf-smtp mailing list
ietf-smtp(_at_)ietf(_dot_)org
https://www.ietf.org/mailman/listinfo/ietf-smtp