(PHP 4 >= 4.0.5, PECL vpopmail >= 0.2)
vpopmail_auth_user — Attempt to validate a username/domain/password
$user
   , string $domain
   , string $password
   [, string $apop
  ] )This function is EXPERIMENTAL. The behaviour of this function, its name, and surrounding documentation may change without notice in a future release of PHP. This function should be used at your own risk.
This function is currently not documented; only its argument list is available.