PHP Scripts are using SendMail instead of SMTP... - Server Wide Issue

[sparkrack]

Thank you for your reply. Yes I have checked the main.cf configuration file and all instances of localhost.$mydomain were changed to $mydomain prior to this incident.

I've also noticed its not actually sending it from the sender domain (using my examples above, customer@customerdomain.com), instead it will send the email from root@localhost.sentora-domain.com, regardless of the steps taken to try to change it.