Hello,
I'm wondering if anyone can point me in the correct direction of finding some information on how to setup Courier 0.42.2 as a backup MX? By this I mean that I don't want it to do any local deliveries for, say domainx.com, I just want it to hold the messages and then forward them on to the primary MX once it comes back up.
Put domainx.com in esmtpacceptmailfor.
Provided that your DNS MX records are properly set up, nothing else is needed.
"Properly set up" means that the actual hostname listed in the MX record, that resolves to the backup server's IP address, is included in the locals file.
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