ietf-smtp
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Re: [ietf-smtp] SMTP status codes 251 and 551

2020-02-10 20:46:13
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?

Email being what it is, there's lots of use of 551 for other purposes
(anti-abuse feedback, etc).

Not surprising.  In response to RCPT TO or something else?

R's,
John

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