SMTP access across two droplets
I have two droplets, one is for my production, which has the WHM cPanel installed, and another one is my testing droplet. For some developments, I need to be able to send email SMTP from testing droplet for testing purpose.
My question is can I allow my testing droplet to use my production droplet for SMTP access in order to send testing email?
My testing droplet uses Ubuntu 16.04 64x
My Production droplet uses CentOS 7.2 64x