Email Privacy Questions

Questions
1

I would like to ask the following email-related questions:

  1. When I send an email, can the recipient know what client I used to send the email through information such as the email header, or any information contained in the email.

  2. Will my privacy be compromised when I send an email that contains with a metadata removed photo?

  3. When I load an email someone sent me that contains a photo, does this compromise my privacy?

2

Yes to all 3 question.
In short: email is neither private nor secure and it never was designed with these features in mind.

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3
  1. No if you use something like SimpleLogin or AnonAddy. Or vanilla Proton (it hides this information)
  2. If not encrypted (like external encryption mode in Proton) yes, if encrypted - no
  3. In Proton - no (it proxies all mails to hide your IP), in any other mails - yes
4

Do you mean external images are opened by Proton proxy, not from external source?

5

@KeepItSimple yes. Here is their official article:

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