Postfix and PHP Integration Problem

I have a website in PHP where users can login/register. I have just uploaded the PHP laravel code to the server with LAMP and Postfix, but the PHP code can't use the postfix to send email to users. Postfix itself works fine via the terminal/command or the roundcube. So it is an integration problem between the PHP and postfix which needs solution. This is the PHP error I get Aug 3 12:42:12 server postfix/smtpd[16286]: warning: connect #3 to subsystem /var/spool/postfix/private/proxymap: Permission denied Aug 3 12:42:22 server postfix/smtpd[16286]: warning: connect #4 to subsystem /var/spool/postfix/private/proxymap: Permission denied I tried all things mentioned on google and stackoverflow with no solution till now So Don't bid if you are not sure 100% you can solve the problem It will be via Teamviewer