all-in-one privacy solution":["Proton Unlimited es una solución de privacidad todo en uno"],"Black Friday":["Black Friday"],"No ads. Privacy by default.":["Sin anuncios. Privacidad por defecto."],"People before profits":["Primero las personas, luego los beneficios"],"Security through transparency":["Seguridad con transparencia"],"The best Proton Mail ${ BLACK_FRIDAY } deals":["Las mejores ofertas de Proton Mail en el ${ BLACK_FRIDAY }"],"The world’s only community- supported email service":["El único servicio de correo electrónico del mundo financiado por la comunidad"]},"specialoffer:limited":{"${ 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":["Cree múltiples direcciones"],"Hide-my-email aliases":["Seudónimos de hide-my-email"],"Quickly unsubscribe from newsletters":["Cancele suscripciones a boletines rápidamente"],"Use your own domain name":["Use su propio dominio"]},"specialoffer:logos":{"As featured in":["Tal como aparece en"]},"specialoffer:metadescription":{"Get an encrypted email that protects your privacy":["Obtenga un correo electrónico cifrado que protege su privacidad"]},"specialoffer:metatitle":{"Proton Mail Black Friday Sale - Up to 40% off":["Oferta de Black Friday de Proton Mail: 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.":["Aproveche las rebajas de Black Friday y obtenga suscripciones de Proton Mail con hasta un 40 % de descuento. Encontrará las mejores ofertas en planes de correo electrónico seguro cifrado de extremo a extremo."]},"specialoffer:newmetatitle":{"Proton Mail Black Friday sale | Up to 40% off secure email":["Rebajas de Black Friday en Proton Mail | Hasta un 40 % de descuento en correo electrónico seguro"]},"specialoffer:note":{"* Billed at ${ TOTAL_SUM } for the first year":["*Con un costo de ${ TOTAL_SUM } durante el primer año"],"*Billed at ${ TOTAL_SUM } for the first 2 years":["*Con un costo de ${ TOTAL_SUM } durante los primeros 2 años"],"30-day money-back guarantee":["Garantía de devolución de dinero de 30 días"],"Billed at ${ TOTAL_SUM } for the first 2 years":["Con un costo de ${ TOTAL_SUM } durante los primeros 2 años"],"Billed at ${ TOTAL_SUM } for the first year":["Con un costo de ${ TOTAL_SUM } durante el primer año"],"You save ${ SAVE_SUM }":["Ahorre ${ SAVE_SUM }"]},"specialoffer:off":{"${ PERCENT_OFF } off":["-${ PERCENT_OFF }"]},"specialoffer:testimonial":{"I love my ProtonMail":["Amo mi Proton Mail"],"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 mantenernos a salvo en el complicado universo 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":["Obtiene aquello por lo que paga. En el caso de la gran tecnología, cuando uno no paga nada, se acostumbra. Dejé de usar Gmail y cambié a @ProtonMail"]},"specialoffer:time":{"Days":["Días"],"Hours":["Horas"],"Min":["min"]},"specialoffer:title":{"And much more":["Y mucho más"],"Safe from trackers":["A salvo de rastreadores"],"Stay organized":["Mantenga todo en orden"],"Black Friday email deals":["Ofertas en correo electrónico del Black Friday"],"Don’t just take our word for it":["No confíe solo en nuestra palabra"],"Make your inbox yours":["Tome posesión de su bandeja de entrada"],"Our story":["Nuestra historia"],"Transfer your data from Google in one click":["Transfiera sus datos de Google con un solo clic"]},"specialoffer:tooltip":{"Access blocked content and browse privately. Includes ${ TOTAL_VPN_SERVERS }+ servers in ${ TOTAL_VPN_COUNTRIES }+ countries, connect up to 10 devices, access worldwide streaming services, malware and ad-blocker, and more.":["Acceda a contenidos bloqueados y navegue de forma privada. Incluye más de ${ TOTAL_VPN_SERVERS } servidores en más de ${ TOTAL_VPN_COUNTRIES } países, se conecta con hasta 10 dispositivos, accede a servicios de transmisión de todo el mundo, bloquea malware y publicidad y mucho más."],"Easily share your calendar with your family, friends or colleagues, and view external calendars.":["Comparta su calendario con familiares, amigos y compañeros fácilmente y consulte 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 seudónimos 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, seudónimos 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.":["Administre hasta 25 calendarios, apps móviles, protegido con cifrado de extremo a extremo, importación de calendario con 1 clic desde Google y más."]},"Status banner":{"Learn more":["Más información"],"Please note that at the moment we are experiencing issues with the ${ issues[0] } service.":["Tenga en cuenta que, en este momento, estamos experimentando problemas con el servicio ${ issues[0] }."],"We are experiencing issues with one or more services at the moment.":["En este momento, tenemos problemas con uno o más servicios."]},"Status Banner":{"At the moment we are experiencing issues with the Proton VPN service":["En este momento, tenemos problemas con el servicio Proton VPN."],"Learn more":["Más información"]},"steps":{"Step":["Paso"]},"suggestions":{"Suggestions":["Sugerencias"]},"Support":{"Sub category":["Subacategoria","Subcategorías"]},"Support article":{"${ readingTime } min":["${ readingTime } minuto","${ readingTime } minutos"],"Category":["Categoría","Categorías"],"Didn’t find what you were looking for?":["¿No encontró lo que buscaba?"],"General contact":["Contacto general"],"Get help":["Obtener ayuda"],"Legal contact":["Contacto legal"],"Media contact":["Contacto para medios"],"Partnerships contact":["Contacto para colaboradores"],"Reading":["Lectura"]},"Support Form Platform option":{"VPN for Android TV":["VPN para Android TV"],"VPN for Apple TV":["VPN para Apple TV"],"VPN for Chromebook":["VPN para Chromebook"]},"Support troubleshooting":{"App version":["Versión de la app"],"Browser":["Navegador"],"Check if this helps":["Compruebe si le sirve"],"Choose a product":["Elija un producto"],"Did this solve your issue?":["¿Le ha resultado útil para resolver el problema?"],"Faster assistance is just a few clicks away":["Solo le separan unos clics de una asistencia más rápida"],"How can we help?":["¿Cómo podemos ayudarle?"],"No, contact support":["No, contactar a soporte"],"Please fill out one field after another":["Complete un campo después de otro"],"Please make your selections":["Realice sus selecciones"],"Proton account":["Cuenta de Proton"],"Proton for Business":["Proton for Business"],"Thank you for your feedback":["Gracias por sus comentarios"],"What can we help with?":["¿En qué podemos ayudarle?"],"Yes":["Sí"]},"support_modal_search_query":{"Search query":["Consulta"]},"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, reporte el problema desde la app Bridge: Ayuda > Reportar 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":["Entrega de correo electrónico y spam"],"Encryption":["Cifrado"],"Login and password":["Inicio de sesión y contraseña"],"Merge aliases and accounts":["Combinar alias y cuentas"],"Migrate to Proton":["Migrar a Proton"],"Notifications":["Notificaciones"],"Other":["Otros"],"Plans and billing":["Planes y facturación"],"Proton for Business":["Proton for Business"],"Sign up":["Regístrese"],"Storage":["Almacenamiento"],"Users, addresses, and identities":["Usuarios, direcciones e identidades"]},"SupportForm:optionIntro":{"Select a topic":["Seleccione un tema"]},"Testimonial":{"Awards":["Premios"],"Customers":["Clientes"],"Featured":["Destacados"],"Go to testimonial source":["Ir a la fuente testimonial"],"Open source of award":["Abrir fuente del premio"],"Open source of quote":["Abrir fuente de la cita"],"Reviews":["Reseñas"],"Videos":["Videos"],"Watch on TikTok":["Ver en TikTok"],"Watch on YouTube":["Ver en YouTube"]},"TestimonialCategory":{"Awards":["Premios"],"Customers":["Clientes"],"Featured":["Destacados"],"Media":["Medios"],"Reviews":["Reseñas"],"Videos":["Videos"]},"Text":{"If you need help, check out our ${ supportLink }.":["Si necesita ayuda, consulte 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 busca haya sido eliminada o que sea un\nenlace antiguo."],"Your question may already have an answer in our knowledge base:":["Puede que haya respuesta a su pregunta en nuestra base de conocimientos:"]},"Title":{"On this page":["En esta página"],"Related articles":["Artículos relacionados"],"Share ${ thisPage }":["Compartir ${ thisPage }"],"Switch to Proton Pass - Contact us":["Cambie a Proton Pass - Contáctenos"],"Thank you!":["¡Gracias!"],"this page":["esta página"]},"tooltip_vpn":{"Access blocked content and browse privately. Includes ${ TOTAL_VPN_SERVERS }+ servers in ${ TOTAL_VPN_COUNTRIES }+ countries, highest VPN speed, ${ TOTAL_VPN_CONNECTIONS } VPN connections, worldwide streaming services, malware and ad-blocker, and more.":["Acceda a contenidos bloqueados y navegue de forma privada. 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Outlook’s emails use standard encryption out of the box. Learn how to use enhanced encryption to send more secure messages and the best Outlook alternative if you’re looking for genuine privacy.
Like most free email providers, Outlook can’t guarantee your emails are completely private. But there are ways to enhance Outlook encryption if you pay extra for an eligible premium account.
Email encryption is a process that encodes a message so that only the intended recipients of the message can read it. The message is encrypted (encoded) into an illegible string of characters called ciphertext. The only way to read it is to decrypt (decode) it into its original, legible format using a unique encryption key.
Outlook uses TLS (Transport Layer Security) to encrypt your emails by default. That means an email is secure when being sent from A to B. But TLS works only if the recipient’s service also supports it.
And once your message arrives, its security depends on what encryption the receiving server uses. As Microsoft explains(nueva ventana), “with TLS, the message might not stay encrypted after the message reaches the recipient’s email provider”.
What’s more, like most free email providers, Outlook retains the encryption keys to your messages so that it can access them.
Although Microsoft says Outlook doesn’t scan emails to target you with ads, it could still hand over their contents to third parties. In fact, Microsoft has been caught working closely with US intelligence agencies(nueva ventana), including helping the National Security Agency (NSA) evade the company’s own encryption to intercept its users’ communications.
If you want to send a more secure message in Outlook, you can enable enhanced encryption, but only if you upgrade to a premium account. You can encrypt messages using the Outlook.com web app or the Outlook desktop app.
How to encrypt an email in the Outlook.com web app
To encrypt an email in the Outlook.com web app, you need to upgrade to a paid subscription, like Microsoft 365 Family, Microsoft 365 Personal, or an eligible enterprise account.
Upgrading your account allows you to encrypt emails using Microsoft 365 Message Encryption, also known as Microsoft Office 365 Message Encryption (OME).
Encrypt an email in Outlook.com (OME)
If you have an eligible paid subscription, you can encrypt messages using OME as follows:
Click on the three-dot menu under the Outlook composer window and choose Encrypt or Encrypt & Prevent Forwarding.
Click Send.
Open an email encrypted with Outlook OME
To read and reply to a message encrypted with OME in Outlook.com, the person you’re writing to must do one of the following:
If they have a Microsoft account, they can sign in to open the email.
If they have a Gmail or Yahoo Mail account, they can choose to open the email inside those web apps or Outlook can send them a passcode to open the email.
If they have any other kind of account, Outlook will send them a passcode to open the email.
The main drawbacks to encrypting an email with OME in Outlook.com are:
Outlook sends the passcode to the same address as the encrypted email, so the message could be accessed if the account is ever breached.
The Encrypt & Prevent Forwarding option adds little extra security as anyone can always take a screenshot of the message and send it anywhere.
You can also encrypt messages in the Outlook desktop app using Microsoft 365 Message Encryption (OME), but this is only available with certain Microsoft enterprise subscriptions.
Encrypt an email in Outlook for desktop (S/MIME)
You can encrypt an email with S/MIME encryption if you have an eligible version of the app or a premium subscription.
Once you’ve enabled S/MIME, you can encrypt an email in your Outlook desktop app as follows:
Compose a new message as usual.
Choose Options → Encrypt → Encrypt with S/MIME.
Click Send.
Note that the person you’re writing to must also have S/MIME enabled with a valid S/MIME certificate. If they don’t, you’ll get the following warning with the option to send the message unencrypted:
The main drawbacks to encrypting with S/MIME in the Outlook app are:
You need to get an eligible paid Microsoft account and have an administrator enable S/MIME. It’s not a simple solution to set up and requires technical skills.
You cannot send a private message to anyone using a regular Outlook account, or any other provider without S/MIME support. You need to verify that they have S/MIME correctly set up before sending.
Unlike PGP end-to-end encryption, S/MIME has a centralized system of certificate authorities that could be compromised, though this may only matter to you if you’re at high risk of surveillance.
Open an email encrypted with S/MIME
If the person you’re writing to has S/MIME correctly configured with a valid S/MIME certificate, they can open the email as usual and it should be decrypted.
If they don’t have S/MIME enabled, you won’t be able to send them an S/MIME-encrypted email. Instead, Outlook gives you the option to send the message unencrypted.
Best Outlook alternative to send a secure email
While Outlook’s enhanced encryption options make your emails more secure, if you want to send genuinely private emails, you need to use end-to-end encryption. That way, you can be sure that only you and the intended recipients of your emails can read them.
You can use third-party plug-ins to add end-to-end encryption to Outlook. But they’re usually enterprise solutions restricted to desktop apps that require an administrator to set up.
The easiest way to send a truly secure email is to use Proton Mail, which gives you the following and more out of the box:
Easy-to-use end-to-end encryption: Any message you send to someone on Proton Mail is end-to-end encrypted automatically — no one but you and your intended recipient(s) can read them.
Password-protected Emails: Easily send an end-to-end encrypted email to anyone not on Proton Mail without any technical knowledge.
Zero-access encryption: No one can access your stored emails without your authorization, not even Proton.
Open-source transparency: All Proton apps are open source and independently audited, so security experts can check they’re secure.
Proton Easy Switch: Automatically transfer and encrypt all your emails, contacts, and calendars from Outlook to Proton Mail in a few clicks.
At Proton, our vision is to provide privacy and security for everyone, everywhere. That’s why we offer Proton Mail free, so join us and send a secure email for free from any device.
If you’d like to support our vision, sign up for a paid plan. Together, we can build a better internet where privacy is the default.