As others have noted, it might be easier and nicer to skip to Cyrus IMAPd
if you're changing mail servers. It's extremely fast even for full-text
mailbox searches ("man squatter" for fulltext indexes used on server-side
SEARCH commands) and very stable. It's also in steady development, and
quite remarkably flexible.
You'll have a hard time getting your head around the authentication
configuration at first, but it's not really that bad and it's well and
truly worth it for such an amazing mail server.
If I had to go back to using an ISP's mail services instead of runing my
own mail server, I'd just fetchmail to a local Cyrus - I'm spoilt by it
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