How can the use of valid email headers like "From: admin@domain.de" improve the deliverability of emails sent through PHP scripts?

Using valid email headers like "From: admin@domain.de" can improve the deliverability of emails sent through PHP scripts because it helps establish trust with email servers. When email headers are properly configured, it reduces the likelihood of emails being marked as spam or rejected by recipient servers. 

$to = "recipient@example.com";
$subject = "Subject of the Email";
$message = "This is the content of the email.";
$headers = "From: admin@domain.de\r\n";
$headers .= "Reply-To: admin@domain.de\r\n";
$headers .= "MIME-Version: 1.0\r\n";
$headers .= "Content-Type: text/html; charset=ISO-8859-1\r\n";

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

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email headers deliverability PHP scripts valid From:

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