Does anyone have any suggestions for zimbra hosting geared towards small web hosting providers. I have 20-30 domains with mostly forwarding aliases and a total of 10-15 POP/IMAP accounts hosted on my one poor server that's also the web and database server. I would love to move all mail operations off of this server and possibly to a zimbra server. This number of accounts clearly doesn't justify me running my own server.

Are there any hosting providers that have plans that work well for small hosting providers like me? Many forwarding addresses, a few accounts, many domains. Allowing domain level administration would also be important.

Any other mail solution suggestions would be great.