Zend mail adding double subject in the header

Question

While implementing the Zend Mail for the Concrete5 CMS. We are getting the double subject in the header of the email. Which is blocking it over the yahoo mail.

All other mail servers are working but yahoo mail rejects the email.

I found these URLs https://github.com/concrete5/concrete5/issues/5737 https://github.com/zendframework/zend-mail/issues/22

But the solution provided is not working.

Answer 1

It looks like the answer is to use only:

$mail->setSubject('My subject')

instead of:

$mail->addHeader('Subject', 'My subject')

That is, do not explicitly add the subject header; allow ZF to do it.

Is that not possible in your case?