all-in-one privacy solution":["Proton Unlimited es solución de privacidad más completa"],"Black Friday":["Black Friday"],"No ads. Privacy by default.":["Sin publicidad. La privacidad por bandera."],"People before profits":["Nos importan las personas, no los beneficios"],"Security through transparency":["Seguridad con transparencia"],"The best Proton Mail ${ BLACK_FRIDAY } deals":["Las mejores ofertas del ${ BLACK_FRIDAY } de Proton Mail"],"The world’s only community- supported email service":["El único servicio de correo electrónico con apoyo de la comunidad"]},"specialoffer:limited":{"${ hours } hour":["${ hours } hora","${ hours } horas"],"${ hoursLeft }, ${ minutesLeft } and ${ secondsLeft } left":["Tiempo restante: ${ hoursLeft }, ${ minutesLeft } y ${ secondsLeft }"],"${ minutes } minute":["${ minutes } minuto","${ minutes } minutos"],"${ seconds } second":["${ seconds } segundo","${ seconds } segundos"],"Limited time offer":["Oferta por tiempo limitado"]},"specialoffer:listitem":{"Create multiple addresses":["Crea varias direcciones"],"Hide-my-email aliases":["Alias de hide-my-email"],"Quickly unsubscribe from newsletters":["Date de baja rápidamente de boletines"],"Use your own domain name":["Usa tu propio nombre de dominio"]},"specialoffer:logos":{"As featured in":["Hablan de nosotros"]},"specialoffer:metadescription":{"Get an encrypted email that protects your privacy":["Apuesta por un servicio de correo electrónico cifrado que protege tu privacidad"]},"specialoffer:metatitle":{"Proton Mail Black Friday Sale - Up to 40% off":["Rebajas de Black Friday de Proton: hasta un 40 % de descuento"]},"specialoffer:newmetadescription":{"Get up to 40% off Proton Mail subscriptions this Black Friday. Find great deals on our secure end-to-end encrypted email plans.":["Contrata Proton Mail con hasta un 40 % de descuento en las rebajas de Black Friday. Encontrarás nuestros planes de correo electrónico cifrado de extremo a extremo al mejor precio."]},"specialoffer:newmetatitle":{"Proton Mail Black Friday sale | Up to 40% off secure email":["Rebajas de Black Friday en Proton Mail | Correo electrónico seguro con hasta un 40 % de descuento"]},"specialoffer:note":{"* Billed at ${ TOTAL_SUM } for the first year":["* A un precio de ${ TOTAL_SUM } durante el primer año"],"*Billed at ${ TOTAL_SUM } for the first 2 years":["*A un precio de ${ TOTAL_SUM } durante los 2 primeros años"],"30-day money-back guarantee":["Garantía de devolución de 30 días"],"Billed at ${ TOTAL_SUM } for the first 2 years":["A un precio de ${ TOTAL_SUM } durante los 2 primeros años"],"Billed at ${ TOTAL_SUM } for the first year":["A un precio de ${ TOTAL_SUM } durante el primer año"],"You save ${ SAVE_SUM }":["Ahorras ${ SAVE_SUM }"]},"specialoffer:off":{"${ DISCOUNT } off":["−${ DISCOUNT }"],"${ PERCENT_OFF } off":["−${ PERCENT_OFF }"]},"specialoffer:testimonial":{"I love my ProtonMail":["Adoro ProtonMail"],"My favorite email service":["Mi servicio de correo electrónico favorito"],"Thanks Proton for keeping us all safe in the complicated internet universe.":["Gracias, Proton, por brindarnos protección en este mundo salvaje de Internet."],"You get what you pay for. In the case of big tech, if you pay nothing, you get used. I quit using Gmail and switched to @ProtonMail":["Dan justo lo que prometen. Si las grandes tecnológicas te ofrecen algo gratis, se aprovechan de ti, por eso dejé de usar Gmail y me pasé a @ProtonMail"]},"specialoffer:time":{"Days":["días"],"Hours":["horas"],"Min":["min"]},"specialoffer:title":{"And much more":["Y mucho más"],"Make your inbox yours":["Personaliza tu bandeja de entrada"],"Safe from trackers":["Evita los rastreadores"],"Stay organized":["Mantenlo todo en orden"],"Black Friday email deals":["Ofertas en correo electrónico del Black Friday"],"Don’t just take our word for it":["Lee testimonios de otras personas"],"Our story":["Nuestra historia"],"Transfer your data from Google in one click":["Transfiere tus datos de Google con un clic"]},"specialoffer:tooltip":{"Access blocked content and browse privately. Includes ${ TOTAL_SERVERS }+ servers in ${ TOTAL_COUNTRIES }+ countries, connect up to 10 devices, access worldwide streaming services, malware and ad-blocker, and more.":["Accede a contenido bloqueado y navega con privacidad. Incluye ${ TOTAL_SERVERS } servidores en más de ${ TOTAL_COUNTRIES } países. Conecta hasta 10 dispositivos, acceder a servicios de streaming de todo el mundo, dispón de la protección de bloqueadores de malware y anuncios, etc."],"Easily share your calendar with your family, friends or colleagues, and view external calendars.":["Comparte tu calendario con familiares, amigos y compañeros fácilmente y consulta calendarios externos."],"Includes support for 1 custom email domain, 10 email addresses, 10 hide-my-email aliases, calendar sharing, and more.":["Incluye compatibilidad con 1 dominio de correo electrónico personalizado, 10 direcciones de correo electrónico, 10 alias de hide-my-email, posibilidad de compartir calendario, etc."],"Includes support for 3 custom email domains, 15 email addresses, unlimited hide-my-email aliases, calendar sharing, and more.":["Incluye compatibilidad con 3 dominios de correo electrónico personalizado, 15 direcciones de correo electrónico, alias ilimitados de hide-my-email, posibilidad de compartir calendario, etc."],"Manage up to 25 calendars, mobile apps, secured with end-to-end encryption, 1-click calendar import from Google, and more.":["Gestiona hasta 25 calendarios protegidos con cifrado de extremo a extremo y con opción, por ejemplo, de importar los de Google con un solo clic."]},"Status Banner":{"At the moment we are experiencing issues with the Proton VPN service":["Hay problemas con el servicio de Proton VPN en estos momentos"],"Learn more":["Más información"]},"Status banner":{"Learn more":["Más información"],"Please note that at the moment we are experiencing issues with the ${ issues[0] } service.":["Ten presente que, en estos momentos, el servicio de ${ issues[0] } está dando problemas de funcionamiento."],"We are experiencing issues with one or more services at the moment.":["Uno o varios servicios están dando problemas de funcionamiento en estos momentos."]},"suggestions":{"Suggestions":["Sugerencias"]},"Support":{"Sub category":["Subcategoría","Subcategorías"]},"Support article":{"${ readingTime } min":["${ readingTime } min","${ readingTime } min"],"Category":["Categoría","Categorías"],"Didn’t find what you were looking for?":["¿No has encontrado lo que buscabas?"],"General contact":["Contacto para consultas generales"],"Get help":["Obtener ayuda"],"Legal contact":["Contacto para cuestiones legales"],"Media contact":["Contacto para prensa y medios de comunicación"],"Partnerships contact":["Contacto para colaboraciones"],"Reading":["Lectura"]},"Support categories":{"Browse Proton product support":["Consulta la página de asistencia para productos de Proton"]},"Support category":{"There is no article in this category yet.":["No hay ningún artículo aún en esta categoría."]},"Support troubleshooting":{"--- Select ---":["--- Selecciona ---"],"App version":["Versión de la aplicación"],"Browser":["Navegador"],"Check if this helps":["Comprueba a ver si te sirve"],"Choose a category for your question":["Elige la categoría de tu consulta"],"Choose a product":["Elegir producto"],"Did this solve your issue ?":["¿Te ha resultado útil para resolver el problema?"],"Faster assistance is just a few clicks away — please make your selections":["Haz unos cuantos clics para obtener ayuda más rápidamente. Haz tu selección."],"No, contact support":["No, contactar con el equipo de asistencia"],"Proton account":["Cuenta de Proton"],"Proton Bridge":["Proton Bridge"],"Proton Calendar":["Proton Calendar"],"Proton Drive":["Proton Drive"],"Proton for Business":["Proton for Business"],"Proton Mail":["Proton Mail"],"Proton Pass":["Proton Pass"],"Proton VPN":["Proton VPN"],"Thank you for your feedback":["Gracias por tus comentarios"],"Troubleshooting":["Solución de problemas"],"What can we help with ?":["¿Cómo podemos ayudarte?"],"Yes":["Sí"]},"support_modal_search_query":{"Search query":["Consulta de búsqueda"]},"support_search_button":{"Search":["Buscar"]},"support_search_i_am_looking_for":{"I'm looking for":["Busco"]},"SupportForm":{"For a faster resolution, please report the issue from the Bridge app: Help > Report a problem.":["Para una resolución más rápida, informa del problema desde la aplicación Bridge: Ayuda > Notificar un problema."],"Information":["Información"]},"SupportForm:option":{"Account Security":["Seguridad de la cuenta"],"Contacts":["Contactos"],"Custom email domain":["Dominio de correo electrónico personalizado"],"Email delivery and Spam":["Envío de correos electrónico y spam"],"Encryption":["Cifrado"],"Login and password":["Inicio de sesión y contraseña"],"Merge aliases and accounts":["Fusionar seudónimos y cuentas"],"Migrate to Proton":["Migrar a Proton"],"Notifications":["Notificaciones"],"Other":["Otro"],"Plans and billing":["Planes y facturación"],"Proton for Business":["Proton for Business"],"Sign up":["Regístrate"],"Storage":["Almacenamiento"],"Users, addresses, and identities":["Usuarios, direcciones e identidades"]},"SupportForm:optionIntro":{"Select a topic":["Selecciona un tema"]},"swiss_baseed_feature":{"Swiss based":["Con sede en Suiza"]},"Testimonial":{"Awards":["Premios"],"Customers":["Clientes"],"Featured":["Destacado"],"Go to testimonial source":["Ir a la fuente del testimonio"],"Reviews":["Opiniones"],"Videos":["Vídeos"]},"Text":{"Find the plan that's right for you":["Encuentra el plan más adecuado para tus necesidades"],"If you need help, check out our ${ supportLink }.":["Si necesitas ayuda, consulta nuestra ${ supportLink }."],"The page you’re looking for might have been removed, or it could be an\nold link.":["Es posible que la página que buscas haya sido eliminada o que sea un\nenlace antiguo."]},"Title":{"On this page":["En esta página"],"Related articles":["Artículos relacionados"],"Share ${ thisPage }":["Compartir ${ thisPage }"],"Thank you!":["¡Gracias!"],"this page":["esta página"]},"Tooltip":{"More information":["Más información"]},"tooltip_calendar":{"Create up to 20 custom & shareable encrypted calendars. On top of that, add up to 5 calendars from friends, family, colleagues, and organizations.":["Crea hasta 20 calendarios personalizados y cifrados que puedes compartir con otras personas, y añade además hasta 5 calendarios de amigos, familiares, compañeros y organizaciones."]},"tooltip_vpn":{"Access blocked content and browse privately. Includes ${ TOTAL_SERVERS }+ servers in ${ TOTAL_COUNTRIES }+ countries, highest VPN speed, ${ TOTAL_VPN_CONNECTIONS } VPN connections, worldwide streaming services, malware and ad-blocker, and more.":["Accede a contenido bloqueado y navega en privado. Tendrás a tu disposición más de ${ TOTAL_SERVERS } servidores en más de ${ TOTAL_COUNTRIES } países, VPN de máxima velocidad, ${ TOTAL_VPN_CONNECTIONS } conexiones VPN, servicios de streaming en todo el mundo, bloqueadores de malware y de anuncios, y mucho más."],"Access blocked content and browse privately. Includes ${ TOTAL_SERVERS }+ servers in ${ TOTAL_COUNTRIES }+ countries, highest VPN speed, 10 VPN connections, worldwide streaming services, malware and ad-blocker, and more.":["Accede a contenido bloqueado y navega en privado. Tendrás a tu disposición más de ${ TOTAL_SERVERS } servidores en más de ${ TOTAL_COUNTRIES } países, VPN de máxima velocidad, 10 conexiones VPN, servicios de streaming en todo el mundo, bloqueadores de malware y de anuncios, y mucho más."]},"version_history_label":{"Version history":["Historial de versiones"]},"version_history_tooltip":{"Store up to ${ versionHistoryNumber } versions of each file for up to ${ years } years":["Almacena hasta ${ versionHistoryNumber } versiones de cada archivo durante ${ years } años como máximo"]},"vpn_features_link":{"View VPN plans":["Ver planes de VPN"]},"vpn_features_useCase":{"Access blocked content and browse privately":["Accede a contenido bloqueado y navega con privacidad"]}}},"unleashApi":"https://account.proton.me/api"};
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All Proton Mail data at rest and in transit is encrypted. However, subject lines in Proton Mail are not end-to-end encrypted, which means if served with a valid Swiss court order, we do have the ability to turn over the subjects of your messages. Your message content and attachments are end-to-end encrypted. See this article for a description of what Proton Mail data is encrypted(new window).
There are two main reasons why subject lines in Proton Mail messages are not end-to-end encrypted.
1. Not Standards Compliant – Proton Mail adheres to the OpenPGP standard which largely respects the SMTP protocol. In PGP, the subject line is part of the header packet, which is not end-to-end encrypted.
Given that PGP does not end to end encrypt subject lines, why does Proton Mail use the OpenPGP standard?
The reason is interoperability. By adhering to OpenPGP, we enable not just end-to-end encrypted messaging with other Proton Mail users, but compatibility with any PGP user worldwide. This means anybody, regardless of what email provider they use, can send end-to-end encrypted messages to Proton Mail users.
The importance of this cannot be overstated. This also allows us to integrate with other services like Facebook. With OpenPGP, Proton Mail isn’t just a standalone encrypted email service, we become part of an entire encrypted ecosystem.
2. Allow for subject line search – By construction, end-to-end encrypted data is not searchable. This is because searching through several gigabytes of emails cannot be properly done on a browser. It must be done on the Proton Mail servers, and with end-to-end encryption, the Proton Mail servers don’t have the ability to read the data. If subject lines were encrypted, it would be impossible to search through emails by subject. This is a huge detriment to everyday email usability.
This situation may change in the future as encryption technology evolves (for example, projects like Mylar being developed at MIT), but at present, searching encrypted data is still far off.
What can I do to protect the subject lines of my email communications?
Even though Proton Mail subject lines are not end-to end encrypted, it is exceptionally difficult for a third party to get access to them. Access would require breaching Swiss data privacy laws and getting a court order that is approved by a Swiss judge(new window).
You can also use generic subject lines that disclose minimal information about the message contents.