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Feb 5, 2016 5:24 PM in response to simonpieby MrHoffman,I think you should backup your disk completely, install, and test your environment for correct operation during an interval when being offline is feasible. If you're running production and don't have a window for outages, then get a second server and test with that.
Email requires absolutely correct DNS forward and correct from your ISP and your DNS provider, or other SMTP servers will detect and treat your SMTP server as a spam engine and drop mail arriving from your server.