Email Not Sending from Byethost Hosting

I deployed my website and I’m trying to send an email from my website that is hosted by Byethost and it displays a success message but for some reason the email is not being received. What might be the problem? Below you will find the PHP script.

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)