On 9/15/2022 8:45 AM, I wrote:
The concept of "secondary MX" dates way back to pre-spam days. I think it can safely be considered an outmoded idea at this point. But if you insist on doing it, make sure that you use: * Recipient validation * Identical anti-spam controls on both hosts
* And ensure that the Primary NEVER rejects anything forwarded from
the Secondary
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http://rob0.nodns4.us/