I apologize in advance, because I'm not very well versed on these kind of subjects because I normally work on the front-end part.
I'm now working on a Symfony website (they are using cPanel as well) where one the major bugs is that it stopped sending emails all of a sudden without anyone touching the code. My first thought was that there would have to be a problem with the email service which is PHPmailer. Since they haven't touched the code in about two year, I'm guessing the problem is that PHPmailer is not updated.
Well, now I don't know how to update PHPmailer. I don't know if I can just trade out the old PHPmailer files for the new ones on the cPanel file administrator, or if there is some specific way to do this. Can anybody please help me?