Hope that helps. It gives you a number of options which should cover all your SMTP scenarios whether authenticating or not .
I hope I have answered your question. If I have please set like on the answer and set as the solution. I look forward to answering more of your questions in the community!
Yes, What @Christopher Hoard Said! Figure out whether you need to send externally or within the organization, What security types your devices supports and choose what kind of solution you need! Direct send , smtp submission or relay! It’s all in the link Chris gave
