It depends on the communication parties , either its PM to PM where it says its endtoend encrypted OR PM to other services where it ' s clearly not . This a r e s o m e s e c u r e e m a i l s e r v i c e s w i t h e n d t oendencryptionanswerJames 503 ? sriduGiTI is also worth reading . Simply encrypting the message using gpg and then sending it , is surely the right way but only if you can handle the inconvenience . Following are some of the services that have made it easier . Free , based in Belgium , True endtoend encryption with digital signatures . Paid , based in Germany , endtoend encryption with Digital signatures . Email is however fundamentally not secure and one has to make several tradeoff ' s depending on their personal preferences , specific requirements and understanding of security privacy on the whole . Though their are some projects i n t ernetmailenvironmentmarch 2015 . pdf , , . which are working on reengineering the protocol but that again is workinprogress . I personally use due to their complete emailing suite docs , calendar , address book , groups , polls , IMAP , POP , . and the ability of Digital signatures however , it all depends on individual preferences and specific requirements . Privacy tools and Vegard secure email services feature matrix . are some of the other places that provides further detail in this regard .