Failed to add recipient: @localhost [SMTP: Invalid response code received from server (code: 555, response: 5.5.2 Syntax error. k4sm217886weq.33)]
<p>I wrote PHP code that suppose to send mail via smtp.gmail.com:587 (using PEAR::Mail) to users with their forgotten password upon request. I get this error message 
"Failed to add recipient: @localhost [SMTP: Invalid response code received from server (code: 555, response: 5.5.2 Syntax error. k4sm217886weq.33)]
". I do not know how to handle this. </p>

<p>Please assist.</p>
