Wietse:
> When a recipient fails with 4xx, Postfix does not give up immediately,
> BUT WILL TRY THE REMAINING MX HOSTS, up to the limits specified
> with $smtp_mx_address_limit and $smtp_mx_session_limit.
OP:
> 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, see CAPITALIZED text above. Postfix does this for all 4XX
recipient replies, not just 45X.
Wietse
