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Re: [ietf-smtp] SMTP Greylisting Retry Hints + PRDR

2019-02-08 06:33:41
John Levine <johnl(_at_)taugh(_dot_)com> wrote:

The only standard compliant way to accept some addresses and reject
others is to accept the message and send a bounce about the addresses
that didn't work.

Another alternative is to split the envelope: if you know at RCPT TO time
that the addresses have different filtering policies which might lead to
unwanted bounces later on, 450 any subsequent addresses that have
stricter policies than the first one. The downside is that this can lead
to undesirable delays especially if the envelope is large.

f.anthony.n.finch  <dot(_at_)dotat(_dot_)at>
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