What's the best free email server to put on my NAS to use the domain I have?

[CowboyTony]

Hi all,

I've bought a NAS (QNAP TS-110) and I have a domain name and am in the middle of creating a website. I also want to create some @(mydomain).co.uk email addresses. What's the best (i.e. easiest and most secure) free email server software out there. I want to be able to access the emails on my BlackBerry so would need to be able to open up a POP3 / IMAP4 port too.
I've never done this before so easy to use / a good community or userguide is important.

Thanks in advance

 

[CowboyTony]

Thanks The_Max_Sti and ruffneck. I'll give that a whirl. It does say the free version doesn't support BlackBerry though but I may be able to get arround that if Google apps supports email forwarding and by spoofing the sent from email address on the BlackBerry.