Just started using Comodo IceDragon. Only issue was transferring passwords and some favorites. Otherwise its slick. What about an alternative to the firefox mail server?
You can try http://www.pmail.com
It’s not an open source, but it’s free (donations welcome). David Harris is in NZ and has done an amazingly good job. There are also encryption / decryption products, extensions and plugins, mostly based on PGP.
Sorry, I first replied to the wrong post