email - Getting error "missing '=' after attribute name" when using PHP mail() -

what error mean when trying run php script that's suppose send email?

.local postfix/sendmail[3921]: fatal: /etc/postfix/main.cf, line 690: missing '=' after attribute name: "??5:wq?:q!? "

there error in /etc/postfix/main.cf @ line 690 - there missing '=' after attribute name: "??5:wq?:q!? "

edit file, fix it.