What are common challenges faced when sending HTML emails using PHP's mail() function?

One common challenge when sending HTML emails using PHP's mail() function is that the email content may not render correctly due to missing headers or improper formatting. To ensure proper rendering of HTML emails, you should include the necessary headers such as Content-Type and MIME-Version 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=iso-8859-1' . "\r\n";

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

Keywords

HTML emails PHP mail() function SMTP email headers email deliverability

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