On Fri, Dec 06, 2024, Mechiel Lukkien via mailop wrote:

>  I don't know why SMTP doesn't have
> an extension that allows response codes for individual recipients after DATA,
> like LMTP does.

PRDR, see for example
Eric A. Hall. SMTP service extension for per-recipient data responses
(PRDR). Draft, Internet Engineering Task Force, 2007.

It seems there {i,wa}sn't enough interest in this.
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