On Tue, Feb 05, 2019, Hector Santos wrote:
Which smtp servers and client follow or honor Greylist SMTP retry hint for
rescheduling retries?
MeTA1 issues the retry time (server),
the client doesn't use it yet.
Quoting ChangeLog:
2018-03-17
Add a retry=delay part to a graylisting reply, e.g.,
421 4.7.0 Come back later. retry=123
(see also draft-santos-smtpgrey-02)
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