What are some common pitfalls to avoid when constructing and sending emails with PHP, especially in relation to headers and content formatting?

One common pitfall when constructing emails in PHP is not properly setting headers, which can lead to emails being marked as spam or not being delivered at all. To avoid this, make sure to include necessary headers such as From, Reply-To, and MIME-Version in your email. Additionally, ensure that your email content is properly formatted with HTML and plain text alternatives for better compatibility across email clients. 

// Example of setting headers and formatting email content properly
$to = "recipient@example.com";
$subject = "Test Email";
$message = "<html><body><p>This is a test email.</p></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";
$headers .= "Reply-To: sender@example.com" . "\r\n";

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

Keywords

PHP email headers content formatting SMTP MIME types

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