Hi folks, study postfix I didn't found how long is the attempt that try to send the mails within queue (how long is attempt?) I see this: maximal_queue_lifetime (default: 5d) Consider a message as undeliverable, when delivery fails with a temporary error, and the time in the queue has reached the maximal_queue_lifetime limit. http://www.postfix.org/postconf.5.html#maximal_queue_lifetime but this line is how time keep mails within queue. Pol