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May
14
comment Can a backup mx server be configured to reject email submissions if it can connect to the primary mx?
a "backup" MX server doesn't just invite spam -- it invites loss of legitimate mail too! It is far too easy to underestimate the problems and risks of doubling the maintenance and monitoring overhead, and even the tiniest cost in overhead would vastly outweigh any possible advantage except for the most exceptionally odd configuration requirements (which would of course require their own exceptional justification)
May
14
comment What to do if one doesn't want to receive email bounces?
not accepting and handling messages sent to the reverse path is a gross violation of sender expectations and a gross violation of good neighbour behaviour. (regardless of whether those messages have an empty sender envelope address themselves, but especially if they have an empty sender address)