schovavam k prozkoumani, prislo mi od meho poskytovatele emailu, tedy or riseup.net
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One way that you can secure your communications is to use OpenPGP to encrypt your email. We recently overhauled our help pages on the best practices for using OpenPGP. If you haven't ever used OpenPGP before, you can take a look at the guide and get started. If you are already an OpenPGP user, you can follow the guide to see how to improve your use of this important tool.
So head on over and take a look at
http://help.riseup.net/security/message-security/openpgp/best-practices