如何在普通的php邮件中添加smtp

Question

我们的电子邮件客户端使用smtp，我喜欢在我试过的以下电子邮件中添加smtp详细信息，但它不起作用，有没有其他方法可以修复此代码？

$mail->IsSMTP();
$mail->SMTPAuth = true;
$mail->Host = "smtp.example.com";
$mail->Port = 26;
$mail->Username = "#@#@#@#@-####-@@@@-#####-@#@#@#@#@#@#";
$mail->Password = "#@#@#@#@-####-@@@@-#####-@#@#@#@#@#@#";

$mailto = "info@example.com";
$subject = "Test mail";  

// To send HTML mail, the Content-type header must be set
$headers  = 'MIME-Version: 1.0' . "\r\n";
$headers .= 'Content-type: text/html; charset=iso-8859-1' . "\r\n";

// Create email headers
$headers = 'From: support@exmaple.com'. "\r\n". 
'Reply-To: '.$email."\r\n" .
'X-Mailer: PHP/' . phpversion();   

$email_message .= "First Name: $fname \r\n";
$email_message .= "Last Name: $lname \r\n";
$email_message .= "Designation: $designation \r\n";
$email_message .= "Email: $email \r\n";
$email_message .= "Phone Number: $phonenumber \r\n";

@mail($mail, $mailto, $subject, $email_message, $headers);