OK I am hoping somebody can help or possibly I am asking the earth here and these just aren't available, I am looking for a Linux or embedded Linux email server. I currently run a email server on an ITX box that has my storage on it but it constantly seems to need maintaining and I just don't have the time, as such for my storage I am moving to NAS boxes and I want to do a similar thing with my email server. I am looking for a little device to plug in to my network, switch on, configure via a browser ideally and the email server is running, this is what I have been doing for my linux based router for years and what I am starting to do with my NAS.... I have found a box called the Bubba mini server which a sort of what I am looking for but is also a web, ftp and storage server as well (all administered via browser) which is really additional functionality I don't need. From the email point of view I need it to ideally be IMAP or webmail based and be able to collect email from pop3 accounts and send and receive smtp email for 4 or 5 SOHO user accounts which is all pretty standard stuff.
Anybody heard of anything like this that would be available in the UK (and usable in the UK on 240V power supply)????
Any recommendations, ideas and advice would be appreciated and many thanks in advance for any given.

I would just get myself an old pII. Ive been running postfix quite successfully on an old 300Mhz machine i picked up for $60, it now sits in my ceiling, silently doing its job.