Email used to be simple.

 It used to be easy to setup and run your own private email server.  I used postfix.

If you wanted to send an email to someone@somewhere.com your server would look up somewhere.com's mail server address from it's DNS record, connect to it's port 25, somewhere.com would say "Hello", you said I have a message for someone, and somewhere.com would say great - send it over.

Now it's all encryption, domain authentication keys, permitted sender policies, spam checks, scam checks, etc, etc, etc.

I gave up and went back to my native gmail address.  Let the experts try and keep up.

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