bilbus

Well, backup mx is fine for queing mail, i use that.

If you want something portable, i dunno .. you are not gonna find a static ip.

Really the only option is putting the box at a co-lo

unless you just want a redundent connection, thats easy.

Are you worried about your building going away? Thats not realistic .. a loss of power happpns ... but if it did you could just take it home, and redirect the dns.

As for a 3g card, its not static, slow upload and limit you to 5gb generaly