title: SMTP server response: 501 <>: missing or malformed local part
body: <p>I am using mime_mailer.php to send emails. When I send email it shows the following error:</p>
  
  <pre class="lang-none prettyprint-override"><code>Warning:    mail() [function.mail]: SMTP server response: 501 &lt;&gt;: 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)
  </code></pre>
  
  <p>Header looks something likes this:</p>
  
  <pre class="lang-none prettyprint-override"><code>To: abc@ourdomain.com
  From: def@ourdomain.com
  X-Mailer: PHP/5.2.9 
  Content-Type: text/html; charset=iso-8859-1 
  Cc: ghi@ourdomain.com, 
  MIME-Version: 1.0
  Content-Type: multipart/related; boundary="mime_boundry_multipart/related_c6644189126a16de6271c67af235ddd0x"
  </code></pre>