> If a site publishes many MX records pointing to the same IP address, > will Postfix do a lot of tries (reducing the amount of pending > recipients in each iteration) in shortes time?
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.
Wietse
