Trying to run an smtp server

I am trying to run an smtp server on a rooted galaxy core prime. I intend to use the mobile data connection for my server and a gandi domain for the server. I'm using the servers ultimate pro app to run the server. I am having no luck setting up the server on my own however. can anyone give me a step by step walk through?
I tried using the mail in a box tutorial from the web and adopting it to direct to my server on the phone but no luck and help would be appreciated.

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