OP:
> Why doesn?t postfix handle the 4.5.3 status code in a special way?
> As long as per iteration the number of recipients
> is reduced, keep retrying without giving up.
Because Postfix needs to be able to deliver email to many sites,
without allowing one receiver to get more Postfix resources
than other receivers. It is a basic security/robustness issue.
Less diplomatical than Victor: ignoring $smtp_mx_session_limit
or $smtp_mx_address_limit, depending on receiver responses, would
be a stupdendously bad idea.
Wietse
