Usually your ISP provides a backup MX for you. This works great until you enable Greylisting and wonder why Greylisting does not work.
The reason is that Greylisting is not enabled on your backup MX and the spammer simply sends all spam over the backup MX, effectively bypassing Greylisting.
The solution is to enable Greylisting on the backup MX. However, not every ISP support Greylisting and this is where our MTA Backup Service steps in.
After enabling your domain you get a backup MX hostname that point to a XWall which has Greylisting enabled.
Thereafter you change your DNS the new backup MX and from then on MTA Backup Service acts as your backup MX. Due that you control the DNS records, you can step back at any time, by simply changing back the MX records.
