[syntaxgoonoo]

Zoho Mail - http://www.zoho.com/mail/

There is a free signup with option for 1 custom domain.

I use it, works great.

[atmosx]

I use zoho too, with 1 custom domain for about 2 years without issues. It's free. The email interface is kind clumsy, but I rarely use it. I go on pop3 mostly.

On the negative side, zoho is a USA based company.

[zhanglun]

I use Zoho Mail, it's good.