> On Jul 29, 2019, at 10:22 AM, Дилян Палаузов <dilyan.palau...@aegee.org>
> wrote:
>
> My reading of your answer is, that by default, if some recipients are
> accepted and others 451/452 rejected, postfix
> closes the SMTP session, reopens a new SMTP session to the same host and
> tries again to that host (smtp_mx_session_limit default 2).
No. After a tempfail, the retry happens with any remaining MX host IP addresses
(the purported hostname is irrelevant), or else the remaining recipients are
deferred.
The retry is not with "the same" IP address.
> That is, for a message with 11 recipients, if the SMTP accepts one recepient
> per SMTP transaction and defers the others
> recipient, for a domain having 50 different IP addresses, postfix will
> deliver the mail to the first ten recipients
> almost at the same time, and delivery to the 11th recipient will be postponed
> to whenever postfix is configured to
> retry.
No, the first 2 recipients will be delivered (limit of two sessions
per-envelope, per queue activation) and the rest deferred.
--
Viktor.
