Fix handling of invalid email addresses in headers (#1489092)

Aleksander Machniak

2013-05-10 bde85428d69069637782d9507475df78890f08d0

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<?php
 
// Help content iframe source
// $rcmail_config['help_source'] = 'http://trac.roundcube.net/wiki';
$rcmail_config['help_source'] = '';