<p>Communication with email servers is always encrypted, unless you explicitly turned this off. This question is about optional end-to-end encryption with PGP or S/MIME. The sender and recipient should first agree on this and exchange signed messages to transfer their public key to be able to send encrypted messages.</p>
<p>Communication with email servers is always encrypted, unless you explicitly turned this off. This question is about optional end-to-end encryption with PGP or S/MIME.</p>
<p>The sender and recipient should first agree on this and exchange signed messages to transfer their public key to be able to send encrypted messages. There is a gesture icon button just above the text of a received message on the right to verify a signature and store the public key.</p>
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<p><em>General</em></p>
<p>Please <ahref="https://en.wikipedia.org/wiki/Public-key_cryptography">see here</a> about how public/private key encryption works.</p>