> You are correct -- it the *remote* mailserver has a temporary problem with > their Internet connection, the connection to the primary may fail, and the > mailserver will contact the backup. So legitimate traffic definitely can > go to the backup.
Exactly. That is why I am putting this on a server with a priority of 50. There is a primary with a priority of 10 (on another network), and a secondary with a priority of 30 sitting right next to it on the same network. Even if the primary server or entire circuit is down, it should still not skip the secondary with an MX of 30.
If that temporary problem lasts a few extra seconds, the attempt to the 2nd mailserver can fail too, causing the remote mailserver to hit the 3rd mailserver.
Rare, yes. Probably rare enough to have very strict spam control on the 3rd mailserver (but not rare enough to delete it, at least for most people).
-Scott
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