This is sieve-connect. A client for the ManageSieve protocol, as
specifed in RFC 5804.

This is not yet fully compatible with RFC 5804, but is moving
towards that from the timsieved baseline; some issues to be
worked on are documented in the "TODO" file.

sieve-connect speaks ManageSieve and supports TLS for connection
privacy and also authentication if using client certificates.
sieve-connect will use SASL authentication; SASL integrity layers
are not supported, use TLS instead. GSSAPI-based authentication
should generally work, provided that client and server can use a
common underlaying protocol. If it doesn't work for you, please
report the issue.

sieve-connect is designed to be both a tool which can be invoked
from scripts and also a decent interactive client. It should also
be a drop-in replacement for "sieveshell", as supplied with Cyrus IMAP.