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login_process_per_connection: no login_process_size: 32 login_processes_count: 100 login_max_connections: 100
s. http://wiki.dovecot.org/LoginProcess
"The maximum number of users logging in at the same time (+ SSL/TLS proxying connections) is login_max_connections * login_max_processes_count."
Is it possible you are hitting the "max num of users" boundary? Dovecot needs one login process per lifetime of a SSL/TLS connection, too.
Bye,
Steffen Kaiser -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux)
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