all-in-one privacy solution":["Proton Unlimited ist eine All-in-One-Datenschutzlösung"],"Black Friday":["Black Friday"],"No ads. Privacy by default.":["Keine Werbung. Privatsphäre als Standard."],"People before profits":["Menschen sind uns wichtiger als Gewinne"],"Security through transparency":["Sicherheit durch Transparenz"],"The best Proton Mail ${ BLACK_FRIDAY } deals":["Die besten Proton Mail-Angebote zum ${ BLACK_FRIDAY }"],"The world’s only community- supported email service":["Der weltweit einzige von der Community unterstützte E-Mail-Dienst"]},"specialoffer:limited":{"${ hours } hour":["${ hours } Stunde","${ hours } Stunden"],"${ hoursLeft }, ${ minutesLeft } and ${ secondsLeft } left":["Nur noch ${ hoursLeft }, ${ minutesLeft } und ${ secondsLeft }"],"${ minutes } minute":["${ minutes } Minute","${ minutes } Minuten"],"${ seconds } second":["${ seconds } Sekunde","${ seconds } Sekunden"],"Limited time offer":["Zeitlich befristetes Angebot"]},"specialoffer:listitem":{"Create multiple addresses":["Erstelle mehrere Adressen"],"Hide-my-email aliases":["Hide-my-email-Aliase"],"Quickly unsubscribe from newsletters":["Newsletter schnell abbestellen"],"Use your own domain name":["Verwende deine eigene Domain"]},"specialoffer:logos":{"As featured in":["Vorgestellt in"]},"specialoffer:metadescription":{"Get an encrypted email that protects your privacy":["Nutze einen verschlüsselte E-Mail-Dienst, der deine Privatsphäre schützt"]},"specialoffer:metatitle":{"Proton Mail Black Friday Sale - Up to 40% off":["Proton Mail Black Friday-Angebot – Bis zu 40 % Rabatt"]},"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.":["Erhalte an diesem Black Friday bis zu 40 % Rabatt auf Proton Mail-Abonnements. Mache tolle Schnäppchen bei unseren sicheren, Ende-zu-Ende-verschlüsselten E-Mail-Abonnements."]},"specialoffer:newmetatitle":{"Proton Mail Black Friday sale | Up to 40% off secure email":["Proton Mail-Black-Friday-Angebot | Bis zu 40 % Rabatt auf sichere E-Mails"]},"specialoffer:note":{"* Billed at ${ TOTAL_SUM } for the first year":["* Zum Preis von ${ TOTAL_SUM } im ersten Jahr"],"*Billed at ${ TOTAL_SUM } for the first 2 years":["*Zum Preis von ${ TOTAL_SUM } in den ersten zwei Jahren"],"30-day money-back guarantee":["30-tägige Geld-zurück-Garantie"],"Billed at ${ TOTAL_SUM } for the first 2 years":["Zum Preis von ${ TOTAL_SUM } in den ersten zwei Jahren"],"Billed at ${ TOTAL_SUM } for the first year":["Zum Preis von ${ TOTAL_SUM } im ersten Jahr"],"You save ${ SAVE_SUM }":["Du sparst ${ SAVE_SUM }"]},"specialoffer:off":{"${ DISCOUNT } off":["− ${ DISCOUNT }"],"${ PERCENT_OFF } off":["− ${ PERCENT_OFF }"]},"specialoffer:testimonial":{"I love my ProtonMail":["Ich liebe mein ProtonMail"],"My favorite email service":["Mein Lieblings-E-Mail-Dienst"],"Thanks Proton for keeping us all safe in the complicated internet universe.":["Danke Proton, dass du uns alle im komplizierten Internet-Universum beschützt."],"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":["Du bekommst, wofür du bezahlst. Wenn du nichts bezahlst, wirst du bei der Nutzung von Big Tech ausgenutzt. Ich habe Gmail aufgegeben und bin zu @ProtonMail gewechselt"]},"specialoffer:time":{"Days":["Tage"],"Hours":["Stunden"],"Min":["Min."]},"specialoffer:title":{"And much more":["Und vieles mehr"],"Make your inbox yours":["Übernimm volle Kontrolle über deinen Posteingang"],"Safe from trackers":["Sicher vor Trackern"],"Stay organized":["Sorge für Ordnung"],"Black Friday email deals":["E-Mail-Angebote zum Black Friday"],"Don’t just take our word for it":["Verlasse dich nicht nur auf unser Wort"],"Our story":["Unsere Geschichte"],"Transfer your data from Google in one click":["Übertrage deine Daten von Google mit einem Klick"]},"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.":["Greife auf blockierte Inhalte zu und surfe privat. Umfasst ${ TOTAL_VPN_SERVERS } Server in über ${ TOTAL_VPN_COUNTRIES } Ländern, die Verbindung \nvon bis zu 10 Geräten, weltweite Streaming-Dienste, Malware- und Werbeblocker und mehr."],"Easily share your calendar with your family, friends or colleagues, and view external calendars.":["Teile deinen Kalender ganz einfach mit Verwandten, Freunden oder Kollegen und rufe externe Kalender auf."],"Includes support for 1 custom email domain, 10 email addresses, 10 hide-my-email aliases, calendar sharing, and more.":["Beinhaltet Unterstützung für eine eigene E-Mail-Domain, 10 E-Mail-Adressen, 10 „hide-my-email“-Aliasse, Kalenderfreigabe und mehr."],"Includes support for 3 custom email domains, 15 email addresses, unlimited hide-my-email aliases, calendar sharing, and more.":["Beinhaltet Unterstützung für 3 benutzerdefinierte E-Mail-Domänen, 15 E-Mail-Adressen, unbegrenzte „hide-my-email“-Aliase, Kalenderfreigabe und mehr."],"Manage up to 25 calendars, mobile apps, secured with end-to-end encryption, 1-click calendar import from Google, and more.":["Verwalte bis zu 25 Kalender, Ende zu Ende verschlüsselte mobile Apps, 1-Klick-Kalenderimporte von Google und vieles mehr."]},"Status Banner":{"At the moment we are experiencing issues with the Proton VPN service":["Im Moment gibt es Probleme mit dem Proton VPN-Dienst"],"Learn more":["Mehr erfahren"]},"Status banner":{"Learn more":["Mehr erfahren"],"Please note that at the moment we are experiencing issues with the ${ issues[0] } service.":["Bitte beachte, dass wir im Moment Probleme mit dem Dienst ${ issues[0] } haben."],"We are experiencing issues with one or more services at the moment.":["Im Moment gibt es Probleme mit einem oder mehreren Diensten."]},"suggestions":{"Suggestions":["Vorschläge"]},"Support":{"Sub category":["Unterkategorie","Unterkategorien"]},"Support article":{"${ readingTime } min":["${ readingTime } Min.","${ readingTime } Min."],"Category":["Kategorie","Kategorien"],"Didn’t find what you were looking for?":["Hast du nicht gefunden, wonach du gesucht hast?"],"General contact":["Allgemeiner Kontakt"],"Get help":["Hilfe erhalten"],"Legal contact":["Kontakt für Rechtliches"],"Media contact":["Kontakt für Medien"],"Partnerships contact":["Kontakt für Partnerschaften"],"Reading":["Lesen"]},"Support troubleshooting":{"App version":["App-Version"],"Browser":["Browser"],"Check if this helps":["Schau, ob das hilft."],"Choose a product":["Produkt auswählen"],"Did this solve your issue?":["Hat dies dein Problem gelöst?"],"Faster assistance is just a few clicks away":["Schnellere Hilfe ist nur ein paar Klicks entfernt"],"How can we help?":["Wie können wir dir helfen?"],"No, contact support":["Nein, Support kontaktieren"],"Please fill out one field after another":["Bitte fülle ein Feld nach dem anderen aus"],"Please make your selections":["Bitte triff deine Auswahl"],"Proton account":["Proton-Konto"],"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":["Danke für dein Feedback"],"What can we help with?":["Wobei können wir dir helfen?"],"Yes":["Ja"]},"support_modal_search_query":{"Search query":["Anfrage suchen"]},"support_search_button":{"Search":["Suchen"]},"support_search_i_am_looking_for":{"I'm looking for":["Ich suche"]},"SupportForm":{"For a faster resolution, please report the issue from the Bridge app: Help > Report a problem.":["Damit das Problem schneller gelöst werden kann, melde es bitte über die Bridge-App: Help > Report a problem (Hilfe > Problem melden)."],"Information":["Informationen"]},"SupportForm:option":{"Account Security":["Kontosicherheit"],"Contacts":["Kontakte"],"Custom email domain":["Benutzerdefinierte E-Mail-Domain"],"Email delivery and Spam":["E-Mail-Zustellung und Spam"],"Encryption":["Verschlüsselung"],"Login and password":["Anmeldung und Passwort"],"Merge aliases and accounts":["Zusammenführung von Aliassen und Konten"],"Migrate to Proton":["Migration zu Proton"],"Notifications":["Benachrichtigungen"],"Other":["Sonstiges"],"Plans and billing":["Abonnements und Abrechnung"],"Proton for Business":["Proton for Business"],"Sign up":["Registrierung"],"Storage":["Speicher"],"Users, addresses, and identities":["Benutzer, Adressen und Identitäten"]},"SupportForm:optionIntro":{"Select a topic":["Thema auswählen"]},"swiss_baseed_feature":{"Swiss based":["In der Schweiz ansässig"]},"Testimonial":{"Awards":["Auszeichnungen"],"Customers":["Kunden"],"Featured":["Empfohlen"],"Go to testimonial source":["Zur Referenzquelle wechseln"],"Reviews":["Bewertungen"],"Videos":["Videos"]},"Text":{"If you need help, check out our ${ supportLink }.":["Hilfe erhältst du in unserem ${ supportLink }."],"The page you’re looking for might have been removed, or it could be an\nold link.":["Die von dir gesuchte Seite wurde möglicherweise entfernt, oder es könnte sich um einen alten Link handeln."]},"Title":{"On this page":["Auf dieser Seite"],"Related articles":["Verwandte Artikel"],"Share ${ thisPage }":["${ thisPage } teilen"],"Thank you!":["Vielen Dank!"],"this page":["diese Seite"]},"Tooltip":{"More information":["Weitere Informationen"]},"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.":["Greife auf blockierte Inhalte zu und surfe privat. Enthält über ${ TOTAL_VPN_SERVERS } Server in mehr als ${ TOTAL_VPN_COUNTRIES } Ländern, höchste VPN-Geschwindigkeiten, ${ TOTAL_VPN_CONNECTIONS } VPN-Verbindungen, weltweite Streaming-Dienste, Malware- und Werbeblocker und mehr."]},"version_history_label":{"Version history":["Versionsverlauf"]},"version_history_tooltip":{"Store up to ${ versionHistoryNumber } versions of each file for up to ${ years } years":["Speichere bis zu ${ versionHistoryNumber } Versionen jeder Datei für einen Zeitraum von bis zu ${ years } Jahren"]}}},"base":"blog","unleashApi":"https://account.proton.me/api","cdn":{"url":"https://pmecdn.protonweb.com/","enabled":"true"}};
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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.
Cyberattacks aren’t always executed through sophisticated methods like
man-in-the-middle (MITM) attacks on public WiFi. Sometimes, they rely on
something as simple as looking over your shoulder.
Shoulder surfing attacks are when someone watches you
Proton prioritizes our community’s privacy and data security in every aspect of
our business.
To further demonstrate our commitment, we underwent a rigorous external audit
and – on May 2, 2024 – received our ISO 27001 certification.
As an organiz
Jeder mit einem iPhone kann jetzt die sicheren und privaten
Fotobackup-Funktionen von Proton Drive nutzen. Dieses Feature wird nach und nach
an die Proton-Community ausgerollt und wird bis Ende dieser Woche für alle
verfügbar sein.
Smartphones haben
Seit dem ersten Tag ist Proton eine andere Art von Organisation. Das war
vermutlich schon daran zu erkennen, wie wir über eine öffentliche
Crowdfunding-Kampagne gestartet sind, bei der 10.000 Leute über 500.000 Dollar
gespendet haben, um die Entwickl
Deine Online-Daten sind wertvoll. Während es so aussehen mag, als ob du
kostenlos im Web surfst, bezahlst du Marketingunternehmen tatsächlich mit deinen
persönlichen Daten. Oftmals sammeln und profitieren diese Unternehmen noch immer
von deinen Daten