Many mail clients keep open multiple IMAP connections. If they are staying around, I would leave them alone. Clients get upset when their connections go away on them, and then they just open a new one so the problem remains.
OTOH, cyrus-imapd prior to 2.3.11 had a bug where SSL-based processes could hang around indefinitely. Use lsof and strace (or whatever your platform offers) to determine whether they are actually still alive.
-- Sebastian Hagedorn - RZKR-R1 (Flachbau), Zi. 18, Robert-Koch-Str. 10 Zentrum für angewandte Informatik - Universitätsweiter Service RRZK Universität zu Köln / Cologne University - Tel. +49-221-478-5587
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