Important Notice: Considering the recent disclosure of vulnerabilities in popular e-mail clients like Mozilla Thunderbird, we decided to delete this post. The current PGP implementation in email clients has vulnerabilities, that haven’t been fixed for now and will take time to get fixed. For more information about the technical side visit efail.de and for a detailed explanation, read the post by the Electronic Frontier Foundation. Thanks for your interest in this topic! We will update this post when new info is available.