PMC OS writes:
If you have decent connections, you are probably better off without backup MXes, except for exceptional magnetic storms, e.g. the Carrington Event, that may result in network failures spread around the globe.Our mails are to important as going without Backup-MX
On the modern Internet, backup MXs have value only in very limited situations. All sending mail servers will keep trying for at least a day, many at least three days. Unless your primary MX routinely goes down for more than a day, you won't lose any mail. And if your primary MX is down that often, be sure to increase the retention period on the backup MX as well. Courier's default retention period is one week.
The only other situation where a backup MX is of any value is when there's a separate connection between the backup MX and the primary MX, and your primary MX's Internet connection is unstable. If the connection goes down, but the primary MX stays up, mail will flow through the backup MX.
I can't see the value of a backup MX in any other situation, so you have to compare these miniscule advantage, against the additional exposure to spam via the backup MX, and the additional maintenance and costs of a backup MX.
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