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use same server with multiple mx records over multiple connections

Hi,

I have two internet lines from two different ISPs.

I use the first one all the time, and secound one is for backup in times that first one is not working.

I have an email server on my network. [Microsoft Exchange]

Is it possible to set two MX records on my DNS. [DNS server is hosted else were] with different priorities. so if first internet connection fails, emails go to second connection?

does this create a loop?

Thanks
Nav444

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neoponder

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neoponder

P.S. you can load balance by giving them the same weight...
Cheers!

neoponder

Question: when your first internet connection fails, are you implying that the ip range/email server on that network is unavilable? you may want to get an AS number and use BGP to advertise out your network. That way, all of your servers/ip ranges are avilable no matter which connection is up.

ccomley

Don't forget, however, to have a *third* MX pointing at an ISP mail server, so your mail still works even if your *server* rather than your 'net connection is unavailable for any reason. Unless you also have your own secondary server. Even then, it's best to have an off-site off-net MX available for your domain.

neoponder

Yes... if you have an ISP mail server. All of ours is "In House". Some people will setup a freeware mail system like "sendmail" and put it at peering site. Unfortunatly that would violate our SarBox requirments. :(

I hope some of this helps Nav444. Let us know!