What are common issues when sending HTML emails using PHP mail() function?

One common issue when sending HTML emails using the PHP mail() function is that the email may not display correctly in the recipient's inbox due to missing headers or incorrect content type. To solve this, make sure to include the proper headers and set the content type to "text/html" in the mail() function. 

$to = "recipient@example.com";
$subject = "HTML Email Test";
$message = "<html><body><h1>Hello, world!</h1></body></html>";
$headers = "MIME-Version: 1.0" . "\r\n";
$headers .= "Content-type:text/html;charset=UTF-8" . "\r\n";
$headers .= 'From: sender@example.com' . "\r\n";

mail($to, $subject, $message, $headers);

Keywords

HTML emails PHP mail function SMTP email headers MIME types

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