all-in-one privacy solution":["Proton Unlimited est une solution tout-en-un respectueuse de la vie privée"],"Black Friday":["Black Friday"],"No ads. Privacy by default.":["Aucune publicité, le respect de la vie privée comme règle absolue"],"People before profits":["Les individus passent avant les profits"],"Security through transparency":["Notre engagement de transparence"],"The best Proton Mail ${ BLACK_FRIDAY } deals":["Les meilleures offres ${ BLACK_FRIDAY } de Proton Mail"],"The world’s only community- supported email service":["La seule messagerie au monde soutenue par la communauté"]},"specialoffer:limited":{"${ hours } hour":["${ hours } heure","${ hours } heures"],"${ hoursLeft }, ${ minutesLeft } and ${ secondsLeft } left":["Temps restant : ${ hoursLeft }, ${ minutesLeft }, ${ secondsLeft }"],"${ minutes } minute":["${ minutes } minute","${ minutes } minutes"],"${ seconds } second":["${ seconds } seconde","${ seconds } secondes"],"Limited time offer":["Offre à durée limitée"]},"specialoffer:listitem":{"Create multiple addresses":["Créez plusieurs adresses"],"Hide-my-email aliases":["Alias « hide-my-email »"],"Quickly unsubscribe from newsletters":["Désabonnez-vous rapidement des newsletters"],"Use your own domain name":["Utilisez votre propre nom de domaine"]},"specialoffer:logos":{"As featured in":["Ils en parlent"]},"specialoffer:metadescription":{"Get an encrypted email that protects your privacy":["Choisissez une messagerie électronique chiffrée qui protège votre vie privée"]},"specialoffer:metatitle":{"Proton Mail Black Friday Sale - Up to 40% off":["Offre Proton Mail Black Friday - Jusqu'à 40 % de réduction"]},"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.":["Obtenez jusqu'à 40 % de réduction sur les abonnements Proton Mail à l'occasion du Black Friday. Profitez d'offres exceptionnelles sur nos abonnements de messagerie électronique sécurisée et chiffrée de bout en bout."]},"specialoffer:newmetatitle":{"Proton Mail Black Friday sale | Up to 40% off secure email":["Offre Black Friday Proton Mail | Jusqu'à 40 % de réduction"]},"specialoffer:note":{"* Billed at ${ TOTAL_SUM } for the first year":["* Facturé ${ TOTAL_SUM } pour la première année"],"*Billed at ${ TOTAL_SUM } for the first 2 years":["*Facturé ${ TOTAL_SUM } pour les 2 premières années"],"30-day money-back guarantee":["Garantie satisfait ou remboursé pendant 30 jours"],"Billed at ${ TOTAL_SUM } for the first 2 years":["Facturé ${ TOTAL_SUM } pour les 2 premières années"],"Billed at ${ TOTAL_SUM } for the first year":["Facturé ${ TOTAL_SUM } pour la première année"],"You save ${ SAVE_SUM }":["Vous économisez ${ SAVE_SUM }"]},"specialoffer:off":{"${ DISCOUNT } off":["-${ DISCOUNT }"],"${ PERCENT_OFF } off":["-${ PERCENT_OFF }"]},"specialoffer:testimonial":{"I love my ProtonMail":["J'adore mon ProtonMail"],"My favorite email service":["Ma messagerie électronique préférée"],"Thanks Proton for keeping us all safe in the complicated internet universe.":["Merci Proton de nous garder en sécurité dans l'univers complexe d'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":["Vous avez ce pour quoi vous payez. Avec les Big Tech, si vous ne payez rien, vous êtes utilisé. J'ai arrêté d'utiliser Gmail et je suis passée @ProtonMail"]},"specialoffer:time":{"Days":["Jours"],"Hours":["Heures"],"Min":["Min"]},"specialoffer:title":{"And much more":["Avec en plus"],"Make your inbox yours":["Votre boite de réception sur mesure"],"Safe from trackers":["À l'abri des traqueurs"],"Stay organized":["Bien organisé"],"Black Friday email deals":["Offres Black Friday pour la messagerie électronique"],"Don’t just take our word for it":["Ce qu'en disent nos utilisateurs"],"Our story":["Notre histoire"],"Transfer your data from Google in one click":["Transférez vos données depuis Google en 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.":["Accédez aux contenus bloqués et naviguez en toute confidentialité. Comprend plus de ${ TOTAL_SERVERS } serveurs répartis dans plus de ${ TOTAL_COUNTRIES } pays, la possibilité de connecter jusqu'à 10 appareils, l'accès aux services de streaming dans le monde entier, un bloqueur de logiciels malveillants et de publicités et d'autres fonctionnalités."],"Easily share your calendar with your family, friends or colleagues, and view external calendars.":["Partagez facilement votre calendrier avec votre famille, vos amis ou collègues et consultez des calendriers externes."],"Includes support for 1 custom email domain, 10 email addresses, 10 hide-my-email aliases, calendar sharing, and more.":["Comprend la prise en charge de 1 domaine de messagerie personnalisé, de 10 adresses e-mail, de 10 alias « hide-my-email », du partage de calendriers et bien d'autres fonctionnalités."],"Includes support for 3 custom email domains, 15 email addresses, unlimited hide-my-email aliases, calendar sharing, and more.":["Comprend la prise en charge de 3 domaines de messagerie personnalisés, de 15 adresses e-mail, d'un nombre illimité d'alias « hide-my-email », du partage de calendriers et bien d'autres fonctionnalités."],"Manage up to 25 calendars, mobile apps, secured with end-to-end encryption, 1-click calendar import from Google, and more.":["Jusqu'à 25 calendriers, des applications mobiles, la sécurité avec le chiffrement de bout en bout, l'importation de calendrier en un clic depuis Google..."]},"Status Banner":{"At the moment we are experiencing issues with the Proton VPN service":["Nous rencontrons actuellement des problèmes avec le service Proton VPN."],"Learn more":["En savoir plus"]},"Status banner":{"Learn more":["En savoir plus"],"Please note that at the moment we are experiencing issues with the ${ issues[0] } service.":["Nous rencontrons actuellement des problèmes avec le service ${ issues[0] }."],"We are experiencing issues with one or more services at the moment.":["Nous rencontrons actuellement des problèmes avec un ou plusieurs services."]},"suggestions":{"Suggestions":["Suggestions"]},"Support":{"Sub category":["Sous-catégorie","Sous-catégories"]},"Support article":{"${ readingTime } min":["${ readingTime } minute","${ readingTime } minutes"],"Category":["Catégorie","Catégories"],"Didn’t find what you were looking for?":["Vous ne trouvez pas ce que vous cherchez ?"],"General contact":["Contact - Général"],"Get help":["Obtenir de l'aide"],"Legal contact":["Contact - Juridique"],"Media contact":["Contact - Média"],"Partnerships contact":["Contact - Partenariats"],"Reading":["Lecture"]},"Support categories":{"Browse Proton product support":["Parcourez le support produit Proton"]},"Support category":{"There is no article in this category yet.":["Il n'y a pas encore d'article dans cette catégorie."]},"Support troubleshooting":{"--- Select ---":["--- Sélectionner ---"],"App version":["Version de l'application"],"Browser":["Navigateur"],"Check if this helps":["Vérifiez si cela vous aide."],"Choose a category for your question":["Choisissez une catégorie pour votre question"],"Choose a product":["Choisir un produit"],"Did this solve your issue ?":["Cela a-t-il résolu votre problème ?"],"Faster assistance is just a few clicks away — please make your selections":["Il suffit de quelques clics pour obtenir une assistance plus rapide, faites votre sélection."],"No, contact support":["Non, contacter le support"],"Proton account":["Compte 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":["Nous vous remercions pour votre commentaire."],"Troubleshooting":["Dépannage"],"What can we help with ?":["Comment pouvons-nous vous aider ?"],"Yes":["Oui"]},"support_modal_search_query":{"Search query":["Recherche"]},"support_search_button":{"Search":["Rechercher"]},"support_search_i_am_looking_for":{"I'm looking for":["Je recherche des informations sur..."]},"SupportForm":{"For a faster resolution, please report the issue from the Bridge app: Help > Report a problem.":["Pour que le problème soit résolu plus rapidement, vous pouvez le signaler à partir de l'application Bridge : Aide > Signaler un bug."],"Information":["Informations"]},"SupportForm:option":{"Account Security":["Sécurité du compte"],"Contacts":["Contacts"],"Custom email domain":["Domaine de messagerie personnalisé"],"Email delivery and Spam":["Distribution des messages et indésirables/spam"],"Encryption":["Chiffrement"],"Login and password":["Identifiant et mot de passe"],"Merge aliases and accounts":["Fusion des alias et des comptes"],"Migrate to Proton":["Migration vers Proton"],"Notifications":["Notifications"],"Other":["Autre"],"Plans and billing":["Abonnements et facturation"],"Proton for Business":["Proton for Business"],"Sign up":["Inscription"],"Storage":["Espace de stockage"],"Users, addresses, and identities":["Utilisateurs, adresses et identités"]},"SupportForm:optionIntro":{"Select a topic":["Choisissez un sujet"]},"swiss_baseed_feature":{"Swiss based":["Basé en Suisse"]},"Testimonial":{"Awards":["Récompenses"],"Customers":["Clients"],"Featured":["Ils en parlent"],"Go to testimonial source":["Accéder aux commentaires"],"Reviews":["Avis"],"Videos":["Vidéos"]},"Text":{"Find the plan that's right for you":["Trouvez l'abonnement adapté à vos besoins"],"If you need help, check out our ${ supportLink }.":["Si vous avez besoin d'aide, consultez notre ${ supportLink }."],"The page you’re looking for might have been removed, or it could be an\nold link.":["La page recherchée a peut-être été retirée ou le lien utilisé n'est plus valide."]},"Title":{"On this page":["Sur cette page"],"Related articles":["Articles similaires"],"Share ${ thisPage }":["Partagez ${ thisPage }"],"Thank you!":["Merci !"],"this page":["cette page"]},"Tooltip":{"More information":["Plus d'informations"]},"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.":["Créez jusqu'à 20 calendriers chiffrés personnalisés et partageables. Ajoutez jusqu'à 5 calendriers d'amis, de membres de votre famille, de collègues ou d'organisations."]},"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.":["Accédez aux contenus bloqués et naviguez en toute confidentialité. Comprend plus de ${ TOTAL_SERVERS } serveurs répartis dans plus de ${ TOTAL_COUNTRIES } pays, la vitesse VPN la plus élevée, ${ TOTAL_VPN_CONNECTIONS } connexions VPN, l'accès aux services de streaming dans le monde entier, un bloqueur de logiciels malveillants et de publicités et d'autres fonctionnalités."],"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.":["Accédez aux contenus bloqués et naviguez en toute confidentialité. Comprend plus de ${ TOTAL_SERVERS } serveurs répartis dans plus de ${ TOTAL_COUNTRIES } pays, la vitesse VPN la plus élevée, 10 connexions VPN, l'accès aux services de streaming dans le monde entier, un bloqueur de logiciels malveillants et de publicités et d'autres fonctionnalités."]},"version_history_label":{"Version history":["Historique des versions"]},"version_history_tooltip":{"Store up to ${ versionHistoryNumber } versions of each file for up to ${ years } years":["Conservez jusqu'à ${ versionHistoryNumber } versions de chaque fichier pendant ${ years } ans."]},"vpn_features_link":{"View VPN plans":["Voir les abonnements VPN"]},"vpn_features_useCase":{"Access blocked content and browse privately":["Accédez aux contenus bloqués et naviguez en toute confidentialité"]}}},"unleashApi":"https://account.proton.me/api"};
// We need to import data (the framework context) from the server
// This Astro feature with define:vars works well but creates an inline script
// So we can't directly import the initFramework helper, we have to store the context
window.frameworkContext = frameworkContext;
})();
Effective Spam Filtering with Encrypted Email | Proton
As many of you have noticed, in recent weeks, spam filtering performance at Proton Mail has dramatically improved. This is because we have recently deployed a series of updates to improve spam filtering performance. In this three part series of posts, we will discuss many of the spam challenges
Proton Mail faces and discuss in detail how to fight spam in the end-to-end encrypted world. Proton Mail’s spam challenges can be summarized broadly into three categories.
Incoming Spam
Outgoing Spam
Internal Spam
Incoming spam is spam sent to Proton Mail from third party email providers, for example Hotmail. Outgoing spam is spammers using Proton Mail to send spam to third party email providers. Finally, Internal spam is Proton Mail accounts being used to spam other Proton Mail accounts. Each of these pose very different risks and challenges. As an encrypted email service provider with over 1 million users, spam is a continuous battle and one of the toughest challenges to overcome.
In this blog post, we will be discussing incoming spam filtering. In future blog posts, we will cover the challenges of preventing Proton Mail from being used by spammers and the challenges of doing spam filtering with end-to-end encrypted emails which we cannot read.
Incoming Spam
Incoming spam is not dangerous, but it can be a major inconvenience for users. Incoming spam doesn’t just clog up user inboxes, but it can also cause a performance problem if not handled efficiently due to the sheer volume of incoming spam emails which sometimes arrives at the Proton Mail servers.
Emails that come from third party email providers obviously cannot be delivered with end-to-end encryption, but upon reaching our mail servers, we will encrypt them with the recipient’s public key before saving the messages(new window). All this is done in memory so that by the time anything is permanently stored to disk, the email is already un-readable to us. This gives us a very limited window to perform spam filtering on incoming messages.
When an incoming message is received, it goes through the following filtering steps. The goal is to use less computationally extensive methods first to reject as much spam as possible before more expensive methods are used.
1. First, the IP address of the incoming SMTP server is checked against spam blacklists which contain IP addresses of servers we have previously received spam from. If we receive a hit, the message is rejected.
2. Secondly, the message is passed through our customized Bayesian filters which marks suspicious messages as spam.
3. Next, we generate checksums of incoming messages and check them against a database of known spam messages. If there is a match, we mark the message as spam. The checksums are done in such a way that it is also effective against mutating spam emails.
4. Afterwards, we also apply a few other anti-spam techniques which we cannot detail here for security reasons (see below)
5. Since email headers can be easily spoofed and abused, we also verify the authenticity (SPF, DKIM, and DMARC) of incoming emails to protect users. An email that fails DMARC(new window) is likely spoofed so it will be sent to the spam folder with a warning for our users.
Over the past few months, we have optimized and improved many of the above components to achieve a 500% improvement in spam detection. In doing this, we learned a few lessons:
Security through Obscurity
Generally speaking, security through obscurity is not recommended. This is why Proton Mail is open source(new window), and we have all of our front end code open to inspection from the community(new window). Security through obscurity is the anti-thesis of open source, and relies on the notion that security of a system can be improved if attackers do not know how the system works. Generally, this is a bad approach. It is better to have a system so secure that even if attackers know how it works, they cannot bypass it. This is certainly the case with the PGP email encryption that Proton Mail utilizes.
However, one case where security through obscurity DOES work is fighting spammers. This is particularly the case when it comes to fighting outgoing spam. Fighting spam is like trying to hit a moving target, it requires constant adjustment and tuning, especially since the distinction between spam and non-spam messages can be unclear at times.
There simply isn’t any foolproof method for defeating spam. Thus, if spammers don’t know how we are blocking their messages, it makes it much more difficult for them to find a workaround. This is why we cannot publish detailed specs of how our spam filters work. It also means we cannot open source our backend server configs which contain our spam filter settings.
In terms of privacy and trust, there is little advantage in open sourcing the server configs because even if the configs were released, there is no way to guarantee that is the config running on the server side. On the other hand, releasing the backend configs would let spammers know exactly what they need to do to bypass our spam filters, which would put the entire Proton Mail community at risk.
Personalized Spam Filtering
Before designing our spam filtering system, we looked through months of spam reports from the community. What we quickly learned is that every user has a different definition of spam. What you consider to be spam won’t be the same as what your neighbor considers to be spam. Thus, it is impossible to define a single ruleset that works for everybody. This pushed us in the direction of personalized rulesets.
Today, every single Proton Mail account comes with its own spam filter settings which are unique to that account. When you mark messages as spam or not-spam, the filter will dynamically adjust to take into account your personal preferences. You can also view and modify your personal spam filter settings(new window). Proton Mail also accounts for whether an email came from one of your contacts or not. If it comes from a contact, it is allowed through the spam filter.
The Best Spam Filter is You
Proton Mail has a comprehensive multi-tiered protection system to prevent spam from entering your inbox, but actually you are the best protection against spam. The vast majority of spam can be avoided by simply not giving your Proton Mail email address to unscrupulous websites which then resell that information to spammers. To learn more about how to avoid receiving spam in the first place, read our guide to avoiding spam.
Sécurisez votre messagerie, protégez votre vie privée
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Les fuites de données sont de plus en plus courantes. Lorsque vous vous
inscrivez à un service en ligne, vous fournissez des informations personnelles
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