all-in-one privacy solution":["Proton Unlimited tam kapsamlı bir gizlilik ve güvenlik çözümüdür"],"Black Friday":["Muhteşem Cuma"],"No ads. Privacy by default.":["Reklamsız. Privacy by default."],"People before profits":["İnsanlar paradan önce gelir"],"Security through transparency":["Şeffaflık ile güvenlik"],"The best Proton Mail ${ BLACK_FRIDAY } deals":["En iyi Proton Mail ${ BLACK_FRIDAY } fırsatları"],"The world’s only community- supported email service":["Dünyanın tek topluluk tarafından desteklenen e-posta hizmeti"]},"specialoffer:limited":{"${ hours } hour":["${ hours } saat","${ hours } saat"],"${ hoursLeft }, ${ minutesLeft } and ${ secondsLeft } left":["${ hoursLeft } - ${ minutesLeft } - ${ secondsLeft } kaldı"],"${ minutes } minute":["${ minutes } dakika","${ minutes } dakika"],"${ seconds } second":["${ seconds } saniye","${ seconds } saniye"],"Limited time offer":["Sınırlı süreli teklif"]},"specialoffer:listitem":{"Create multiple addresses":["Birden adres oluşturun"],"Hide-my-email aliases":["Hide-my-email takma adları (e-posta adresi)"],"Quickly unsubscribe from newsletters":["Bülten aboneliğinden hızlı ayrılma"],"Use your own domain name":["Kendi etki alanınızı kullanın"]},"specialoffer:logos":{"As featured in":["Belirtildiği gibi"]},"specialoffer:metadescription":{"Get an encrypted email that protects your privacy":["Gizliliğinizi koruyan bir şifreli e-posta edinin"]},"specialoffer:metatitle":{"Proton Mail Black Friday Sale - Up to 40% off":["Proton Mail Muhteşem Cuma İndirimleri - %40'a varan indirimler"]},"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.":["Bu Muhteşem Cuma'da Proton Mail aboneliklerinde %40'a varan indirimlerden faydalanın. Uçtan uca şifrelenmiş e-posta tarifelerimiz için muhteşem fırsatlardan yararlanın."]},"specialoffer:newmetatitle":{"Proton Mail Black Friday sale | Up to 40% off secure email":["Proton Mail Muhteşem Cuma İndirimleri - Güvenli e-postada %40'a varan indirimler"]},"specialoffer:note":{"* Billed at ${ TOTAL_SUM } for the first year":["* İlk yıl için ${ TOTAL_SUM } üzerinden faturalandırılır"],"*Billed at ${ TOTAL_SUM } for the first 2 years":["*ilk 2 yıl için ${ TOTAL_SUM } üzerinden faturalandırılır"],"30-day money-back guarantee":["30 günlük para iade garantisi"],"Billed at ${ TOTAL_SUM } for the first 2 years":["İlk 2 yıl için ${ TOTAL_SUM } üzerinden faturalandırılır"],"Billed at ${ TOTAL_SUM } for the first year":["İlk yıl için ${ TOTAL_SUM } üzerinden faturalandırılır"],"You save ${ SAVE_SUM }":["${ SAVE_SUM } tasarruf ediyorsunuz"]},"specialoffer:off":{"${ DISCOUNT } off":["${ DISCOUNT } indirim"],"${ PERCENT_OFF } off":["${ PERCENT_OFF } indirim"]},"specialoffer:testimonial":{"I love my ProtonMail":["ProtonMail'imi seviyorum"],"My favorite email service":["En sevdiğim e-posta hizmeti"],"Thanks Proton for keeping us all safe in the complicated internet universe.":["Hepimizi bu karışık internet evreninde güvende tuttuğun için teşekkürler Proton."],"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":["Ödediğinizin karşılığını alırsınız. Big Tech şirketleri söz konusu olduğunda, hiçbir şey ödememiyorsanız sizi kullanırlar. Gmail kullanmayı bıraktım ve @ProtonMail hizmetine geçtim"]},"specialoffer:time":{"Days":["Gün"],"Hours":["Saat"],"Min":["Dakika"]},"specialoffer:title":{"And much more":["Ve çok daha fazlası"],"Make your inbox yours":["Gelen kutunuzu kendize özel tutun"],"Safe from trackers":["İzleyicilerden güvende olun"],"Stay organized":["Düzenli kalın"],"Black Friday email deals":["Muhteşem Cuma e-posta fırsatları"],"Don’t just take our word for it":["Sırf bizden duymuş olmayın"],"Our story":["Öykümüz"],"Transfer your data from Google in one click":["Google'dan bilgilerinizi tek tıkla aktarın"]},"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.":["Yasaklı içeriklere erişin ve gizlice gezinin. ${ TOTAL_VPN_COUNTRIES } üzeri ülkede ${ TOTAL_VPN_SERVERS } üzerinde sunucu, 10 aygıta kadar bağlantı, dünya çapındaki yayın hizmetlerine erişim, kötü amaçlı yazılım ve reklam engelleyici, ve daha fazlasını içerir."],"Easily share your calendar with your family, friends or colleagues, and view external calendars.":["Takviminizi bir bağlantı aracılığıyla ailenizle, arkadaşlarınızla veya iş arkadaşlarınızla paylaşın ve başka takvimleri görüntüleyin."],"Includes support for 1 custom email domain, 10 email addresses, 10 hide-my-email aliases, calendar sharing, and more.":["1 özel e-posta etki alanı, 10 e-posta adresi, 10 hide-my-email takma adı, takvim paylaşma ve daha fazlası için destek içerir."],"Includes support for 3 custom email domains, 15 email addresses, unlimited hide-my-email aliases, calendar sharing, and more.":["3 özel e-posta etki alanı, 15 e-posta adresi, sınırsız hide-my-email takma adı, takvim paylaşma ve daha fazlası için destek içerir."],"Manage up to 25 calendars, mobile apps, secured with end-to-end encryption, 1-click calendar import from Google, and more.":["25'ye kadar takvim yönetin, mobil uygulamalar, uçtan uca şifreleme ile koruma, Google'dan tek tıkla aktarma ve daha fazlası."]},"Status banner":{"Learn more":["Ayrıntılı bilgi alın"],"Please note that at the moment we are experiencing issues with the ${ issues[0] } service.":["Şu anda ${ issues[0] } hizmeti ile ilgili sorun yaşamaktayız, bilginize."],"We are experiencing issues with one or more services at the moment.":["Şu anda bir veya daha fazla hizmet ile ilgili sorun yaşamaktayız."]},"Status Banner":{"At the moment we are experiencing issues with the Proton VPN service":["Şu anda Proton VPN hizmetiyle ilgili sorunlar yaşıyoruz"],"Learn more":["Ayrıntılı bilgi alın"]},"suggestions":{"Suggestions":["Öneriler"]},"Support":{"Sub category":["Alt kategori","Alt kategori"]},"Support article":{"${ readingTime } min":["${ readingTime } dakikalık","${ readingTime } dakikalık"],"Category":["Kategori","Kategori"],"Didn’t find what you were looking for?":["Aradığınızı bulamadınız mı?"],"General contact":["Genel iletişim"],"Get help":["Yardım alın"],"Legal contact":["Hukuki iletişim"],"Media contact":["Medya iletişimi"],"Partnerships contact":["Ortaklık iletişimi"],"Reading":["Okuma süresi"]},"Support troubleshooting":{"App version":["Uygulama sürümü"],"Browser":["Tarayıcı"],"Check if this helps":["Yardımcı olabilecek bu cevaba bir göz atın"],"Choose a product":["Bir ürün seçin"],"Did this solve your issue?":["Bu, sorununuzu çözdü mü?"],"Faster assistance is just a few clicks away":["Daha hızlı yardım birkaç tık uzağınızda"],"How can we help?":["Nasıl yardımcı olabiliriz?"],"No, contact support":["Hayır, destekle iletişime geçin"],"Please fill out one field after another":["Lütfen alanları tek tek sırayla doldurun"],"Please make your selections":["Lütfen seçimlerinizi yapın"],"Proton account":["Proton hesabı"],"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":["Geri bildiriminiz için teşekkürler"],"What can we help with?":["Ne konuda yardımcı olabiliriz?"],"Yes":["Evet"]},"support_modal_search_query":{"Search query":["Sorgu ara"]},"support_search_button":{"Search":["Ara"]},"support_search_i_am_looking_for":{"I'm looking for":["Şunu arıyorum: -"]},"SupportForm":{"For a faster resolution, please report the issue from the Bridge app: Help > Report a problem.":["Daha hızlı bir çözüm için, lütfen sorunu Bridge uygulamasının Yardım > Bir sorun bildir kısmından bildiririn."],"Information":["Bilgi"]},"SupportForm:option":{"Account Security":["Hesap Güvenliği"],"Contacts":["Kişiler"],"Custom email domain":["Özel e-posta etki alanı"],"Email delivery and Spam":["E-posta iletimi ve istenmeyen e-postalar"],"Encryption":["Şifreleme"],"Login and password":["Oturum ve şifre"],"Merge aliases and accounts":["Takma adları (e-posta adresi) ve hesapları birleştir"],"Migrate to Proton":["Proton üzerine aktarım"],"Notifications":["Bildirimler"],"Other":["Diğer"],"Plans and billing":["Tarifeler ve faturalandırma"],"Proton for Business":["Proton for Business"],"Sign up":["Hesap açma"],"Storage":["Depolama"],"Users, addresses, and identities":["Kullanıcılar, adresler ve kimlikler"]},"SupportForm:optionIntro":{"Select a topic":["Bir konu seç"]},"swiss_baseed_feature":{"Swiss based":["İsviçre merkezli"]},"Testimonial":{"Awards":["Ödüller"],"Customers":["Müşteriler"],"Featured":["Öne Çıkanlar"],"Go to testimonial source":["Müşteri görüşünün kaynağına git"],"Reviews":["İncelemeler"],"Videos":["Videolar"]},"Text":{"If you need help, check out our ${ supportLink }.":["Yardıma ihtiyacınız varsa ${ supportLink } ziyaret edebilirsiniz."],"The page you’re looking for might have been removed, or it could be an\nold link.":["Aradığınız sayfa kaldırılmış veya eski bir\nbağlantı olabilir."]},"Title":{"On this page":["Bu sayfada"],"Related articles":["İlgili makaleler"],"Share ${ thisPage }":["${ thisPage } paylaşın"],"Thank you!":["Teşekkürler!"],"this page":["Bu sayfayı"]},"Tooltip":{"More information":["Daha fazla bilgi"]},"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.":["Yasaklı içeriklere erişin ve gizlice gezinin. ${ TOTAL_VPN_COUNTRIES } üzeri ülkede ${ TOTAL_VPN_SERVERS } üzerinde sunucu, en yüksek VPN hızını, ${ TOTAL_VPN_CONNECTIONS } VPN bağlantısı, dünya çapındaki yayın hizmetlerini, kötü amaçlı yazılım ve reklam engelleyici, ve daha fazlasını içerir."]},"version_history_label":{"Version history":["Sürüm geçmişi"]},"version_history_tooltip":{"Store up to ${ versionHistoryNumber } versions of each file for up to ${ years } years":["Her dosyanın ${ versionHistoryNumber } sürümünü ${ years } yıla kadar tutun"]}}},"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.
E-postalarınızı güvenli hale getirin, gizliliğinizi koruyun
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