v1.1 has now:

# Maximum number of connections allowed for a user. The limits are enforced
# separately for IMAP and POP3 connections, so you can move this setting
# inside protocol {} to have separate settings for them. NOTE: The user names
# are compared case-sensitively, so make sure your userdb returns usernames
# always using the same casing so users can't bypass this limit!
#mail_max_user_connections = 10

Is 10 a good default?

Currently new connections just fail authentication with a "Maximum
number of connections exceeded" error message. v2.0 hopefully will
instead disconnect the oldest idling connection with IMAP.

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