Preauth Option

The  option (available under ,  ,  , and  ) enables pre-authentication by the MMP. When  is set to   (  in legacy configuration),  a user is authenticated against the LDAP server before a connection is made to the backend mailstore server. When  is set to   (  in legacy configuration), the MMP connects to the backend mailstore server and simply replays the authentication information. Because of the additional authentication step,  reduces the overall performance, but protects the backend mailstore servers from denial-of-service attacks by unapproved users. is mandatory for the POP-before-SMTP feature of the MMP.

When using, the   attribute in the domain node in the LDAP server overrides this option.

The default value is: 0

See also:
 * preauthtimeout Option
 * hosteddomains Option
 * MMP and IMAP Proxy and POP Proxy and vdomain options
 * vdomain options