Nick Ellson writes:
I have a second system that I want to act as a backup MX receiver for my domain. So it could accept mail for "nickellson.com" but then hold onto it until my primary internal system can take it. (Just not sure how to search the docs for that functionality). Right now both systems are duplicates of each other and are accepting mail for and delivering locally. (duplicate accounts on both). Any pointers on what I should be looking at for docs?
Unless you expect your primary to be routinely down for prolonged periods of time -- at least a day at a time, a backup MX will not gain you anything.
To turn one of your servers into a backup MX, remove the domain from locals or hosteddomains, and add it to esmtpacceptmailfor (if it's not there already). If you have an unusual DNS setup, you may also need to make an additional entry to esmtproutes.
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