We offer simple, affordable Backup MX service.
If your email server goes offline our servers will accept your email, store it, and when your server comes back online it will deliver your email to you. And it's simple to activate. All you have to do is sign up, change your MX records, and it's ready to go.
Essentially you will be using our Spam Filtering Service in backup mode. You will have all the functionality of our spam/virus filteirng service but used as a backup to your primary email delivery.
Because its a backup service we're only charging $5/month per domain.
Please contact us for details.