What's the best possible email failover solution

[Lucas Holt]

Keep in mind that storing mail in a RDBMS as a backup requires an 
efficient method to restore mail into your mail server's format.

Would it be possible to have a second mail server internal to your 
network that would receive copies of the mail from the primary mail 
server to store them as a backup?  This would be closer to real time 
and for the most part would beat the 30 minute interval to do an rsync. 
  In addition, if the system proved reliable you could rsync the 
secondary at night and not have the primary down at all.

Lucas Holt
Luke at FoolishGames.com
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