Two errors when sending in session variable basaed email form
I am using a form which sends an email to the users address which is pulled from a session variable. When I attempt to do this I get the following errors.
Warning: mail() [function.mail]: SMTP server response: 503 This mail server requires authentication when attempting to send to a non-local e-mail address. Please check your mail client settings or contact your administrator to verify that the domain or address is defined for this server. in C:\Inetpub\vhosts\divisionxcomics.ieasysite.com\httpdocs\WA_Universal_Email\mail_PHP.php on line 260
Warning: Cannot modify header information - headers already sent by (output started at C:\Inetpub\vhosts\divisionxcomics.ieasysite.com\httpdocs\WA_Universal_Email\mail_PHP.php:260) in C:\Inetpub\vhosts\divisionxcomics.ieasysite.com\httpdocs\password_forgot_success.php on line 40
Any idea what's causing this?