User receiving this error, ho do I fix this? All my other php scripts work. Warning: mail() [function.mail <http://www.php.net/function.mail>]: SMTP server response: 530 5.7.1 Authentication required. Please configure your email client to perform authentication when sending email. in dath....common.inc.php on line 320 Warning: Cannot modify header information - headers already sent by (output started at dath....common.inc.php:320) in dath....pluginspaymentpaypal_rpaypal_r.inc.php on line 232