> If the primary MX is accepting connections and telling it to try > again later, don't SMTAs try the primary again before sending to a > secondary, hence the need for the RST packet in the firewall in the > nolisting info ? I might be totally wrong about that, but I was > thinking the secondary was only used when the primary was unreachable > or returning fatal errors ? >
When an MTA get a fatal error (5xx) it normally shouldn't try again at all, also not on the secondary MX. A fatal error can for example by "recipient unknown". I don't know if there is a difference between the retry-schedule for no response from the primary MX, or a temporary error (4xx). I would assume that most MTA's would handle both the same way, but haven't tested this yet. Sincerely, Bart Mortelmans - To unsubscribe from this list: send the line "unsubscribe xmail" in the body of a message to [EMAIL PROTECTED] For general help: send the line "help" in the body of a message to [EMAIL PROTECTED]
