Some background: I have set up an Ubuntu cloud server on Rackspace where I host two domains, say, www.domain1.co.uk and www.domain2.co.uk.
Both domains are hosted on the same cloud server. I purchased the domains from 123-reg and redirected the name servers to my rackspace servers and it all works fine.
Requirement: I need to enable domain specific mail accounts for both domains so I can send and receive mail from firstname.lastname@example.org and email@example.com.
I've looked into setting up a mail server on the domain servers. But I really would like to keep the server free. What would be the best/most cost effect/simplest options for achieving the requirements and how would I go about setting it up?
Sorry if this is too open a question.
Thanks for your help!