I was able to give Mailgun a try recently and all I can say is Kudos !!!
Finally someone who has made Email Servers easy to deal with !!!
I will go so far as to say, Mailgun has made dealing with Email easier than Google !!!
But then we have to remember that Google does not offer the same level of service as Mailgun.
I was able to get setup with Mailgun in 1-2 hours with very nice integration with Rackspace Cloud DNS.
I was previously using ZoneEdit for my DNS needs in this regard however I think it’s time to go with Rackspace.
