Hi Malcom,
I am currently migrating a large number of IMAP/POP accounts from one server to another. The old server using a schema of CLIENTID-0, CLIENTID-1 etc as the naming schema, and it is required that the new server use the user@domain naming schema.
You cold manage authorization using some database mechanism, where you could have multiple users; however you would have to separate authentication and autorization then. There would be one main problem for which I don't known any solution now: you can't grant access to users in a different realm; and your old users are in the servername realm, your new ones in their own domain's.
Another possibility: perhaps Perdition or some other IMAP proxy can help? I don't use it yet, but it has some nice options, e.g. it can present accounts on different servers on one frontend. So perhaps it has some features that can help you.
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