If you downloaded the Fastmail app from Google Play, you would not be asking about POP and SMTP settings. The Fastmail app wraps the web browser, and does not require that kind of setup. You are, I think, trying to configure the standard Android mail app on Samsung.
If you were trying to use mail.messagingengine.com with SSL and port 995, I am puzzled as to why you had a problem, not that I recommend use of the old server.
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