IMAP proxy based on AbstractImapProxy, allowing only the minimal command set.

All flags are accepted. The following commands are permitted: AUTHENTICATE; CAPABILITY; CHECK; CLOSE; EXAMINE; FETCH; FIND; GETACL; LIST; LOGIN; LOGOUT; LSUB; NAMESPACE; NOOP; RLIST; RLSUB; SELECT; STATUS; UID; EXPUNGE; STORE.

The permitted capabilities are the following IMAP4; IMAP4rev1; ACL; QUOTA; NAMESPACE; X-NON-HIERARCHICAL-RENAME; NO_ATOMIC_RENAME; UNSELECT; MAILBOX-REFERRALS; LOGIN-REFERRALS; AUTH=LOGIN.