Ubuntu 16 with serverpilot, create emails with domains. What's the best way?

I’m new to digital ocean, I’m still learning to work on a VPS server. I used serverpilot to set up my apps, just in one domain to test, and I need to create emails with that domain. but I did not get it at all. already tried: mailgun iredmail roundcube postfix with gmail I tried multiple times and always made mistakes that I can not find similar on the web I need to set up emails in a free way. Can someone give me a light? thank you


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