I'm interested in the aggregator too.. What I'd really like to know is if I can use Courier as a back-end.. I have several thousand mail boxes, and converting from Maildir just isn't an option, but I'm finding a strong lack of imap proxy software out there.
You can't. First, the backend must register their mailbox list with the MUPDATE master server via the MUPDATE protocol, which only Cyrus support. Second, mailbox operations (creation, deletion, rename, etc) on backend must first be reserved via the MUPDATE protocol too. Third, your backend servers must support proxy authentication (ie SASL DIGEST-MD5 mechanism) to receive connection from the frontends, which Courier does not support AFAIK.
Theorically, it is possible to have a Murder with various IMAP implementation as long as every node support the MUPDATE protocol. At this point though, only Cyrus implement it.
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