Zend_Mail sent email is treated as SPAM

Question

Please tell me what I am doing wrong. I am sending an email using the Zend_Mail class like this:

$message = <<

        

Answer 1

I have solved this by adding these lines:

$mail->setReplyTo('contact@company.com', 'Company');
$mail->addHeader('MIME-Version', '1.0');
$mail->addHeader('Content-Transfer-Encoding', '8bit');
$mail->addHeader('X-Mailer:', 'PHP/'.phpversion());

The critical line seems to be adding Reply-To header. Without that it would always go to SPAM. Once I set the Reply-To header email clients stopped treating it as spam.