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@humptydumpty Also if you're using the built in mail server, make sure you can contact your ISP and get them to change the PTR record for your IP to your SMTP server address (default: my.<domain>.<tld>
@atridad I configured it to work with my existing Mailgun account as I didn't want to deal with my ISP. I had issues with them in the past regarding simpler things like billing Q's and plan changes.. imagine the horror if I ask about technical stuff
For a future project, I'm going to try to run a CR home server on a residential internet plan with SPECTRUM/TIME WARNER. North American residents will understand the struggle lol.