Hosting web and email on multiple domains for one organization

recently after facing a DDOS attack on the coroprate website and domain, several solution and stratgey are being looked at but no one guarntees 100% continuity. we are planning to host our coporate web and email on multiple domains such as abc.org, aabbcc.org abcc.org on different ISP’s IP subnets.

in case any one fo the domain is targetted by the attackers, the other domain could be used for web site and email delivery and reciepts. website contents updates will be internally managed. is it a good way of managing such crisis?

-Asim Iqbal