Sync IMAP Mailboxes/Folders via ssh?

[Peter P. <pet...@fa...>]

Hi list,

(this might be slightly-OT)

my employer is forcing me to host all emails, that are older than X
years, somewhere else than on his IMAP server. I am using multiple
clients and isync. I am now thinking of moving certain imap folders from
the employer's server to some network storage, which would only be
accessible through ssh/scp/rsync but not through the imap protocol.

Can isync sync emails through such connections as well?
Is the "Tunnel" commenad the way to go?

Thanks for all ideas and advice!
Peter