Sending SMTP mail using phpmailer

<?phprequire_once ('../class.phpmailer.php');
// include("class.smtp.php"); // optional, gets called from within class.phpmailer.php if not already loaded
$mail = new PHPMailer(true); // the true param means it will throw exceptions on errors, which we need to catch$mail->IsSMTP(); // telling the class to use SMTPtry { $mail->Host = "mail.yourdomain.com"; // SMTP server $mail->SMTPDebug = 2; // enables SMTP debug information (for testing) $mail->SMTPAuth = true; // enable SMTP authentication $mail->SMTPSecure = "tls"; // sets the prefix to the servier $mail->Host = "smtp.gmail.com"; // sets GMAIL as the SMTP server $mail->Port = 587; // set the SMTP port for the GMAIL server $mail->Username = "yourusername@gmail.com"; // GMAIL username $mail->Password = "yourpassword"; // GMAIL password $mail->AddReplyTo('name@yourdomain.com', 'First Last'); $mail->AddAddress('whoto@otherdomain.com', 'John Doe'); $mail->SetFrom('name@yourdomain.com', 'First Last'); $mail->AddReplyTo('name@yourdomain.com', 'First Last'); $mail->Subject = 'PHPMailer Test Subject via mail(), advanced'; $mail->AltBody = 'To view the message, please use an HTML compatible email viewer!'; // optional - MsgHTML will create an alternate automatically $mail->MsgHTML(file_get_contents('contents.html')); $mail->AddAttachment('images/phpmailer.gif'); // attachment $mail->AddAttachment('images/phpmailer_mini.gif'); // attachment $mail->Send(); echo "Message Sent OK<p></p>\n"; }

catch(phpmailerException $e) { echo $e->errorMessage(); //Pretty error messages from PHPMailer }

catch(Exception $e) { echo $e->getMessage(); //Boring error messages from anything else! }

PHPMailer SMTP Error: Could not authenticate using gmail as smtp server

PHPMailer SMTP Error: Could not authenticate using gmail as smtp server
Causes

1. invalid username
1. try username@gmail.com instead of username
2. invalid password
3. invalid secure option
1. use ssl, tls not SSL, TLS
4. invalid port 
1. use port 587 or 465