What are some common pitfalls when setting the sender address in PHP form mailers?

One common pitfall when setting the sender address in PHP form mailers is using an invalid or unverified email address, which can cause emails to be marked as spam or rejected by the recipient's email server. To solve this issue, it is important to set the sender address to a valid and verified email address that matches the domain of the server sending the email.

// Set the sender address to a valid and verified email address
$sender_email = "yourname@yourdomain.com";

// Set additional headers to ensure the email is sent from the correct address
$headers = "From: $sender_email\r\n";
$headers .= "Reply-To: $sender_email\r\n";

// Send the email using the specified sender address and headers
mail($recipient_email, $subject, $message, $headers);