Thanks ed this snip is perfect.
'root' => 'vd=' . preg_replace('|.*@|i', '', Auth::getAuth()) . \
',o=clients,dc=radiowave,dc=net',
--
No virus found in this outgoing message.
Checked by AVG Anti-Virus.
Version: 7.0.308 / Virus Database: 266.9.15 - Release Date: 16/04/2005