thnaks nayr for your reply... I have a few questions about this:
If I want a second server only for failover because I don't have a lot of traffic in my primary server and only have a few minor sites and mailboxes:
Is this the only way to setup this?
Do you know if there is a howto for this?
The HAproxy for the web servers that are mentioned in the howtos that I sayd above could be useful?
Thanks a lot and sorry for my english!!