If you send an email to someone without Tutanota.  They email the recipient with a link to their server.  Allowing the recipient to decrypt the email in the browser, using a password agreed on, by the communicating parties.[0]<p>[0]-<a href="https:&#x2F;&#x2F;tutanota.uservoice.com&#x2F;knowledgebase&#x2F;articles&#x2F;470795-how-do-i-send-an-encrypted-email-to-an-external-re" rel="nofollow">https:&#x2F;&#x2F;tutanota.uservoice.com&#x2F;knowledgebase&#x2F;articles&#x2F;470795...</a>