I hope you realize that by using a secondary MX you have gained absolutely and totally nothing. The only difference that made is that instead of mail queueing up on the senders' mail relays, the mail gets queued up on the secondary MX. And exactly what did that gain you?
wouldn't it avoid users getting the "message couldn't be delivered for X hours" messages?
Only if the sending mail server actually implements this feature. Not all do. Furthermore, what exactly would be the problem with that? Do you think it's actually better for the sender to think that the message went through, when it is still stuck somewhere? I think the sender is really better off knowing what the deal is.
Or prevent long-term issues and full-on bounces if (god forbid) my line goes down for a day or more?
If your E-mail is so mission-critical, you better have redundant circuits and hardware in place.
Sometimes people think their E-mail is more important than it really is.
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