SMTP server response: 501 <>: missing or malformed local part

Question

I am using mime_mailer.php to send emails. When I send email it shows the following error:

Warning:    mail() [function.mail]: SMTP server response: 501 <>: missing or malformed local part
Script:     /ppm/lm_response.php
File:   mime_mailer.php
Line:   33
Time:   2012-05-08 23:55:50 (PDT)
Warning:    Cannot modify header information - headers already sent by (output started at D:\xampp\htdocs\ppm\common.php:275)
Script:     /ppm/lm_response.php
File:   lm_response.php
Line:   44
Time:   2012-05-08 23:55:50 (PDT)

Header looks something likes this:

To: [email protected]
From: [email protected]
X-Mailer: PHP/5.2.9 
Content-Type: text/html; charset=iso-8859-1 
Cc: [email protected], 
MIME-Version: 1.0
Content-Type: multipart/related; boundary="mime_boundry_multipart/related_c6644189126a16de6271c67af235ddd0x"

Solution

I bet it's complaining about the empty address in the Cc: field. Take out the trailing comma and you should be fine.