What are some common pitfalls to avoid when sending mass emails in PHP to prevent spamming or blacklisting?

One common pitfall to avoid when sending mass emails in PHP is not properly configuring the email headers, such as the "From" address and the "Reply-To" address. If these headers are not set correctly, your emails may be marked as spam or even lead to your server being blacklisted. To prevent this, always ensure that your email headers are set up properly before sending mass emails. 

// Set the email headers
$headers = "From: Your Name <your@email.com>\r\n";
$headers .= "Reply-To: Your Name <your@email.com>\r\n";
$headers .= "MIME-Version: 1.0\r\n";
$headers .= "Content-Type: text/html; charset=ISO-8859-1\r\n";

// Send the email
$success = mail($to, $subject, $message, $headers);

if($success) {
    echo "Email sent successfully";
} else {
    echo "Failed to send email";
}

Keywords

SMTP SPF DKIM email headers rate limiting

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