[LUNI] email hosting recommendation

[luther rochester]

Hello,
I want to switch hosting providers for our email only, and here is my 
dream scenario:

- IMAP for some accounts and POP for others (is this possible?)
- 3-4 gig/account for IMAP accounts
- greylisting with user-configurable time limits
- no blacklisting (Spamcop etc. = evil)

Anybody have any suggestions of a good service?
Thanks,
-- 
Luther Rochester
Purchasing/IT Manager
Scooterworks USA Inc.
773.271.4242 x243 tel