WindowsĪ lot of webmail providers support email encryption via the OpenPGP standard using Mailvelope. No security audits have been done by us and, thus, we cannot provide any security guarantees. The authors of this webpage are not actively participating in the development of each of these third-party apps. Webmail Provider with In-Browser CryptographyĪll email applications on this page support the OpenPGP standard either directly or with additional software.