the problem with genuinely secure email is that you can only talk to people using the same protocol as you. encrypted messages require a client that can decrypt them and worse, most providers that give encrypted message support only do so for messages sent to other users of the same platform. conversely, if you’re talking to other tech savvy people, you can use whatever mail service you like and just encrypt your messages.

I’m not aware of any means to protect email metadata. you can configure a local mail server to not send the client ip but the receiving server will still know which mail server was used to send the message. also, running a mail server is unreasonably hard, especially because email wasn’t designed to handle a mail server being down in a reasonable way. you can straight up lose messages to the ether if you’re not careful.

my advice is to use something like tutanota or protonmail only for communication that can’t happen by some other means and to use something like matrix for everything else. if it’s an even remotely spicy conversation, don’t send emails about it.

tuta.io for email and router level vpn

silent_water’s response is really good. More can be said if you can describe what your objective is. The unfortunate thing about cyber security is it’s really just a culmination of techniques and info, many of them disparate from each other, or at times irrelevant to what you’re trying to do in the moment.

write a letter by hand or with a mechanical typewritter, place black tissue paper on either side of the paper, fold those three papers into an envelope, seal the envelope, seal it again with wax and a hand carved stamp, post the letter

this is the most secure method of communication.

If u have to ask then ppl cant dox ur address through ur ip address the most they can get is a general region which probably isnt even that accurate The only thing I can think of is it shows who ur isp is and they called them and were/pretended to be the police or something to get ur subscriber info