You can always configure a backup link by adding following commands
backup delay 1 1
ip route 0.0.0.0 0.0.0.0 50"
but from your explaination of your network what is my concern is that if you are running a web/mail server in your LAN and they had to be available from internet, then how will you define them< will you give 2 IPs to everyone?)
2) traffic arriving from the internet towards your Web mail servers (is it web mail or web and mail?)
For problem 1) there is a rather simple solution: use two static routes. An example IP routing config for a single router would look like this:
description to ISP A
ip address 220.127.116.11 255.255.255.252
description to ISP B
ip address 18.104.22.168 255.255.255.252
ip route 0.0.0.0 0.0.0.0 Serial0/0
ip route 0.0.0.0 0.0.0.0 Serial0/1 250
The second default route will only be used, if the first one is invalid, i.e. if Serial0/0 is down. You need to adjust interface names and IP addresses.
Regarding problem 2) the situation is much more complicated. The first question is: how do clients connect to your Web mail servers? Are they using DNS or are they connecting to a specific IP? Is the IP of the servers registered to you (which I doubt) or to ISP A? In the latter case the problem is, that it is unlikely to convince ISP B to route traffic towards addresses from ISP A to your site AND announce those addresses to the internet.
If you have NAT in place the situation gets even more complicated. So could you please clarify the suggested setup regarding IP addresses and the way clients will find the server. If this is known, the answer will be more easily described.
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