“交付给下一个收件人永久失败”是什么意思[关闭]

Question

What does the following error mean when trying to send mail() in PHP?

Delivery to the following recipient failed permanently

What are the causes etc. I notice that this happens when trying to send mail from the same domain. eg. website: example.com to email [e-mail]. If I try to send to [e-mail] or even [e-mail], it works

Answer 1

I found out it usually is caused by the missing receiving email account