+The primary change this brings is support for DIGEST-MD5 and NTLM,
+when the server support it.
+
+** Gnus include a password cache mechanism in password.el.
+
+It is enabled by default (see `password-cache'), with a short timeout
+of 16 seconds (see `password-cache-expiry'). If PGG is used as the
+PGP back end, the PGP passphrase is managed by this mechanism.
+Passwords for ManageSieve connections are managed by this mechanism,
+after querying the user about whether to do so.
+
+** IMAP identity (RFC 2971) is supported.