This extension is EXPERIMENTAL. The behaviour of this extension -- including the names of its functions and anything else documented about this extension -- may change without notice in a future release of PHP. Use this extension at your own risk.
This extension has been moved from PHP as of PHP 4.3.0 and now vpopmail lives in » PECL.
As of PHP 4, these functions are only available if PHP was configured with --with-vpopmail[=DIR].