Have you ever had your mail server crash and have mail messages bouce back to the senders? Yes it is a horrible thing when your mail server crashes. The scramble begins for the IT department. All incoming email is bouncing.
Your IT department is trying to correct the problem and rushing to fix it. This can lead to many fast desicions and sometimes wrong desicions are made when rushing to fix the problem.
If your email is critical to you and your business you should have a backup email server that spools all incoming email when your server is down. This is known by a few names backup MX, store&forward, ETRN.
Email Spooling – This is a highly scalable and efficient service for customers with an internal messaging system (such as Microsoft Exchange, Novell GroupWise, Lotus Notes, etc.) that is connected to the Internet.
A simple modification of the MX records in the DNS of your domain name (so as to reference the backup server) will direct your mail to the backup server until your server comes back online.
| Record FQDN |
Record Type |
Record Value |
MX Pref |
| domain.com |
MX |
mail.domain.com |
10 |
| domain.com |
MX |
backup.domain.com |
100 |
When the primary mail server is not available the mail is delivered to the backup mail server. Once your primary server comes back online, the backup server sends the stored email to the primary server
Below is the normal config
This is what will happen if you have a backup in place and your server is unavailable.

Implementing this type of back up is very easy to do and will give all IT people the peace of mind they need to do there jobs better.
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