Prune expired sessions from the tls sessions database
tls_prune [ -C config-file ]
Tls_prune is used to prune expired sessions from the TLS sessions database. The lifetime of a TLS session is determined by the tls_session_timeout configuration option.
Tls_prune reads its configuration options out of the imapd.conf(5) file unless specified otherwise by -C.
-C config-file
Read configuration options from config-file.
/etc/imapd.conf