As most here, I'd advise to go for a commercial service. Selfhosting is fun but can cause unnecessary headaches.
Fastmail seems to have an impeccable reputation.
I have been using sherweb for several years now. Works very well. It's a bit more expensive but you also get a lot more, too.
Think calendar, contacts. Plus, most smartphones work wonderfully with the Exchange mailbox.
They are located in Canada.
Last but not least, the webmail interface finally works well in other browsers than IE.
http://www.sherweb.com/hosted-exchange/hosted-exchange-featu...
They also support IMAP.
Are there any good hosters based on Zimbra out there?
Fastmail seems to have an impeccable reputation. I have been using sherweb for several years now. Works very well. It's a bit more expensive but you also get a lot more, too. Think calendar, contacts. Plus, most smartphones work wonderfully with the Exchange mailbox. They are located in Canada. Last but not least, the webmail interface finally works well in other browsers than IE. http://www.sherweb.com/hosted-exchange/hosted-exchange-featu... They also support IMAP.
Are there any good hosters based on Zimbra out there?