KerberosV4,
GSSAPI (Kerberos v5),
TODO Backend doesn't seem to be so differentiated, or does it automatically. The UI and IDL API only knows "secure" auth on/off, whatever "secure" may mean.
-->
<pop3>
smtp-after-pop (authenticate to incoming mail server first
before contacting the smtp server)-->
<!-- TODO auth types like incoming? -->
<addThisServer>true</addThisServer>
<useGlobalPreferredServer>true</useGlobalPreferredServer>