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http://www.faqs.org/rfcs/rfc1893.html 4.4.5 4.X.X Persistent Transient Failure A persistent transient failure is one in which the message as sent is valid, but some temporary event prevents the successful sending of the message. Sending in the future may be successful. X.4.X Network and Routing Status The networking or routing codes report status about the delivery system itself. These system components include any necessary infrastructure such as directory and routing services. Network issues are assumed to be under the control of the destination or intermediate system administrator. X.4.5 Mail system congestion The mail system was unable to deliver the message because the mail system was congested. This is useful only as a persistent transient error.   "congestion", wat dat ook moge wezen.  ... Afficher plus