Configure msmtp in openlitespeed


I have several Wordpress websites on my Digitalocean droplet with OpenLiteSpeed.
I also have some basic php websites on it that need to be able to send email.

On my previous droplet I had configured to use gmail as a relay. For this I used msmtp and configured the sendmail_path in the php.ini from apache.

But now I cant find how to configure this for openlitespeed. Where are the files located? Do I need to enable msmtp in openlitespeed separately?