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Mail switch naming and addressing at Cambridge - Tony Finch

dotatfanf wrote
on 5th December 2011 at 18:24
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Mail switch naming and addressing at Cambridge

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Date:2011-12-06 11:52 (UTC)
Your hunch is wrong. Much more relevant is the way MTAs treat them, and indeed there's no consensus on the right semantics - see section 5 of RFC 5321.

The right way to deal with outages is to have diverse locations for the MXs. Unless you are playing tricks they have to have the same accept/reject criteria, to avoid problems with backscatter, which implies they have to be basically configured the same way. The traditional third-party backup MX is generally a bad idea and has been for ten years or more.
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