No more lost email during downtime!!!Add Zone Services
Here's how it works. Suppose your domain is "example.com" and your MX record is "mail.example.com". You would add two more MX records as follows:
Service MX Backup and MX Gateway - Update MX records from 1 October 2015.
In order for this to work we have to see our backup server in your MX records. DNS propagation often take several hours and because of that this service can't be used immediately upon changing your MX records. You should wait for several hours before testing.
Additionally we do forward callout testing to make sure your server is actually down and we don't pass email if your server is running. The reason for this is that we don't want to be a back door spam source for your domain. So if your server is running we will return a 4xx error so that email will retry to your server.
When your server comes back online our servers will detect it and automatically transfer backed up email. Depending on how long you were down and how much email we have for you it might take some time to deliver all your email. If you use grey listing or other rate limiting setting it could take even longer. Our system is not compatible with SPF so if you reject your good email based on SPF then you will lose it. SPF breaks email forwarding. All our servers however have RDNS set to *.sixwishlist.com so you can white lists us to avoid bouncing your good email.
Although we try to do it right sometimes things don't work for any number of reason within and not within our control. We're not responsible for anything lost from using our service.