all-in-one privacy solution":["Proton Unlimited jest wszystko-w-jednym rozwiązaniem prywatności"],"Black Friday":["Czarny Piątek"],"No ads. Privacy by default.":["Brak reklam. Prywatność w standardzie."],"People before profits":["Ludzie przed zyskiem"],"Security through transparency":["Bezpieczeństwo dzięki przejrzystości"],"The best Proton Mail ${ BLACK_FRIDAY } deals":["Najlepsze oferty Proton Mail ${ BLACK_FRIDAY }"],"The world’s only community- supported email service":["Jedyna na świecie społecznościowa- obsługiwana usługa e-mail"]},"specialoffer:limited":{"${ hours } hour":["${ hours } godzina","${ hours } godziny","${ hours } godzin","${ hours } godziny"],"${ hoursLeft }, ${ minutesLeft } and ${ secondsLeft } left":["Pozostało: ${ hoursLeft }, ${ minutesLeft } i ${ secondsLeft }"],"${ minutes } minute":["${ minutes } minuta","${ minutes } minuty","${ minutes } minut","${ minutes } minuty"],"${ seconds } second":["${ seconds } sekunda","${ seconds } sekundy","${ seconds } sekund","${ seconds } sekundy"],"Limited time offer":["Oferta ograniczona czasowo"]},"specialoffer:listitem":{"Create multiple addresses":["Utwórz wiele adresów"],"Hide-my-email aliases":["Aliasy hide-my-email"],"Quickly unsubscribe from newsletters":["Szybko anuluj subskrypcję biuletynów"],"Use your own domain name":["Korzystaj z własnej nazwy domeny"]},"specialoffer:logos":{"As featured in":["Opinie naszych klientów"]},"specialoffer:metadescription":{"Get an encrypted email that protects your privacy":["Uzyskaj zaszyfrowaną usługę e-mail, która chroni Twoją prywatność"]},"specialoffer:metatitle":{"Proton Mail Black Friday Sale - Up to 40% off":["Wyprzedaż Proton Mail z okazji Czarnego Piątku – uzyskaj do 40% zniżki"]},"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.":["Uzyskaj do 40% zniżki na subskrypcje Proton Mail w ten Czarny Piątek. Znajdź wspaniałe oferty naszych bezpiecznych planów usługi poczty elektronicznej w szyfrowaniu end-to-end."]},"specialoffer:newmetatitle":{"Proton Mail Black Friday sale | Up to 40% off secure email":["Wyprzedaż Proton Mail z okazji Czarnego Piątku | Do 40% zniżki na bezpieczną pocztę elektroniczną"]},"specialoffer:note":{"* Billed at ${ TOTAL_SUM } for the first year":["* Płatne ${ TOTAL_SUM } za pierwszy rok"],"*Billed at ${ TOTAL_SUM } for the first 2 years":["* Płatne ${ TOTAL_SUM } za pierwsze 2 lata"],"30-day money-back guarantee":["30-dniowa gwarancja zwrotu pieniędzy"],"Billed at ${ TOTAL_SUM } for the first 2 years":["Płatne ${ TOTAL_SUM } za pierwsze 2 lata"],"Billed at ${ TOTAL_SUM } for the first year":["Płatne ${ TOTAL_SUM } za pierwszy rok"],"You save ${ SAVE_SUM }":["Oszczędzasz ${ SAVE_SUM }"]},"specialoffer:off":{"${ PERCENT_OFF } off":["-${ PERCENT_OFF }"]},"specialoffer:testimonial":{"I love my ProtonMail":["Uwielbiam ProtonMail"],"My favorite email service":["Moja ulubiona usługa e-mail"],"Thanks Proton for keeping us all safe in the complicated internet universe.":["Dziękuję Protonowi za dbanie o nasze bezpieczeństwo w skomplikowanym internetowym uniwersum."],"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":["Dostajesz to, za co płacisz. W przypadku przedsiębiorstw big tech, jeśli nie płacisz nic, zostaniesz wykorzystany. Przestałam korzystać z Gmail i przeniosłam się na @ProtonMail"]},"specialoffer:time":{"Days":["Dni"],"Hours":["Godz."],"Min":["Min"]},"specialoffer:title":{"And much more":["I wiele więcej"],"Safe from trackers":["Bezpieczny od elementów śledzących"],"Stay organized":["Dbaj o dobrą organizację"],"Black Friday email deals":["Oferty e-mailowe na Czarny Piątek"],"Don’t just take our word for it":["Nie musisz wierzyć nam na słowo"],"Make your inbox yours":["Spraw, aby twoja skrzynka odbiorcza była twoja"],"Our story":["Nasza historia"],"Transfer your data from Google in one click":["Przenieś dane z Google jednym kliknięciem"]},"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.":["Uzyskaj dostęp do zablokowanych treści i przeglądaj prywatnie Internet. Obejmuje ponad ${ TOTAL_VPN_SERVERS } serwerów w ponad ${ TOTAL_VPN_COUNTRIES } krajach z możliwością połączenia do 10 urządzeń, a także dostęp do globalnych usług streamingu, blokadę reklam, złośliwego oprogramowania i wiele więcej."],"Easily share your calendar with your family, friends or colleagues, and view external calendars.":["Łatwo udostępniaj swój kalendarz rodzinie, znajomym oraz współpracownikom i wyświetla kalendarze zewnętrzne."],"Includes support for 1 custom email domain, 10 email addresses, 10 hide-my-email aliases, calendar sharing, and more.":["Zawiera obsługę 1 niestandardowej domeny e-mail, 10 adresów e-mail, 10 aliasów hide-my-email, udostępnianie kalendarza i nie tylko."],"Includes support for 3 custom email domains, 15 email addresses, unlimited hide-my-email aliases, calendar sharing, and more.":["Obejmuje obsługę 3 niestandardowych domen e-mail, 15 adresów e-mail, nielimitowane aliasy hide-my-email, udostępnianie kalendarza i nie tylko."],"Manage up to 25 calendars, mobile apps, secured with end-to-end encryption, 1-click calendar import from Google, and more.":["Zarządzanie nawet 25 kalendarzami, aplikacje mobilne, bezpieczne szyfrowanie metodą end-to-end, importowanie kalendarza za pomocą jednego kliknięcia z Google i więcej."]},"Status banner":{"Learn more":["Dowiedz się więcej"],"Please note that at the moment we are experiencing issues with the ${ issues[0] } service.":["Uwaga: obecnie występują problemy z usługą ${ issues[0] }."],"We are experiencing issues with one or more services at the moment.":["Mamy problemy z co najmniej jedną usługą."]},"Status Banner":{"At the moment we are experiencing issues with the Proton VPN service":["W tej chwili mamy problemy z usługą Proton VPN"],"Learn more":["Dowiedz się więcej"]},"steps":{"Step":["Krok"]},"suggestions":{"Suggestions":["Sugestie"]},"Support":{"Sub category":["Podkategoria","Podkategorie","Podkategorii","Podkategorii"]},"Support article":{"${ readingTime } min":["${ readingTime } min","${ readingTime } min","${ readingTime } min","${ readingTime } min"],"Category":["Kategoria","Kategorie","Kategorii","Kategorii"],"Didn’t find what you were looking for?":["Nie znaleziono szukanej frazy?"],"General contact":["Skontaktuj się, wykorzystując ogólne zapytanie"],"Get help":["Uzyskaj pomoc"],"Legal contact":["Skontaktuj się z działem prawnym"],"Media contact":["Skontaktuj się z zespołem medialnym"],"Partnerships contact":["Skontaktuj się z zespołem ds. partnerstwa"],"Reading":["Odczytywanie"]},"Support Form Platform option":{"VPN for Android TV":["VPN dla Android TV"],"VPN for Chromebook":["VPN dla Chromebooka"]},"Support troubleshooting":{"App version":["Wersja aplikacji"],"Browser":["Przeglądarka"],"Check if this helps":["Sprawdź, czy to pomoże"],"Choose a product":["Wybierz produkt"],"Did this solve your issue?":["Czy Twój problem został rozwiązany?"],"Faster assistance is just a few clicks away":["Szybsze wsparcie uzyskasz w kilka kliknięć"],"How can we help?":["Jak możemy pomóc?"],"No, contact support":["Nie, skontaktuj się z pomocą techniczną"],"Please fill out one field after another":["Wypełnij pola jedno po drugim"],"Please make your selections":["Dokonaj wyboru"],"Proton account":["Konto Proton"],"Proton for Business":["Proton for Business"],"Thank you for your feedback":["Dziękujemy za podzielenie się opinią"],"What can we help with?":["W czym możemy pomóc?"],"Yes":["Tak"]},"support_modal_search_query":{"Search query":["Zapytanie wyszukiwania"]},"support_search_button":{"Search":["Szukaj"]},"support_search_i_am_looking_for":{"I'm looking for":["Szukam"]},"SupportForm":{"For a faster resolution, please report the issue from the Bridge app: Help > Report a problem.":["W celu szybszego rozwiązania problemu dokonaj zgłoszenia przez aplikację Bridge: Pomoc > Zgłoś problem."],"Information":["Informacje"]},"SupportForm:option":{"Account Security":["Bezpieczeństwo konta"],"Contacts":["Kontakty"],"Custom email domain":["Niestandardowa domena e-mail"],"Email delivery and Spam":["Dostarczanie wiadomości e-mail i spam"],"Encryption":["Szyfrowanie"],"Login and password":["Login i hasło"],"Merge aliases and accounts":["Scalanie aliasów i kont"],"Migrate to Proton":["Migracja do Proton"],"Notifications":["Powiadomienia"],"Other":["Inne"],"Plans and billing":["Plany i rozliczenia"],"Proton for Business":["Proton for Business"],"Sign up":["Rejestracja"],"Storage":["Przestrzeń dyskowa"],"Users, addresses, and identities":["Użytkownicy, adresy i tożsamości"]},"SupportForm:optionIntro":{"Select a topic":["Wybierz temat"]},"swiss_baseed_feature":{"Swiss based":["Ulokowany w Szwajcarii"]},"Testimonial":{"Awards":["Nagrody"],"Customers":["Klienci"],"Featured":["Wyróżnione"],"Go to testimonial source":["Przejdź do źródła referencji"],"Open source of award":["Otwórz źródło nagrody"],"Open source of quote":["Otwórz źródło cytatu"],"Reviews":["Opinie"],"Videos":["Pliki wideo"],"Watch on TikTok":["Oglądaj na TikTok"],"Watch on YouTube":["Oglądaj na YouTube"]},"TestimonialCategory":{"Awards":["Nagrody"],"Customers":["Klienci"],"Featured":["Wyróżnione"],"Media":["Multimedia"],"Reviews":["Opinie"],"Videos":["Pliki wideo"]},"Text":{"If you need help, check out our ${ supportLink }.":["Jeśli potrzebujesz pomocy, sprawdź naszą ${ supportLink }."],"The page you’re looking for might have been removed, or it could be an\nold link.":["Strona, której szukasz, mogła zostać usunięta lub link jest przestarzały."],"Your question may already have an answer in our knowledge base:":["Na Twoje pytanie może już istnieć odpowiedź w bazie wiedzy:"]},"Title":{"On this page":["Na tej stronie"],"Related articles":["Powiązane artykuły"],"Share ${ thisPage }":["Udostępnij ${ thisPage }"],"Switch to Proton Pass - Contact us":["Przejdź na Proton Pass – skontaktuj się z nami"],"Thank you!":["Dziękujemy!"],"this page":["tę stronę"]},"Tooltip":{"More information":["Więcej informacji"]},"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.":["Uzyskaj dostęp do zablokowanych treści i przeglądaj prywatnie Internet. Obejmuje ponad ${ TOTAL_VPN_SERVERS } serwerów w ponad ${ TOTAL_VPN_COUNTRIES } krajach, najwyższe prędkości VPN, ${ TOTAL_VPN_CONNECTIONS } połączeń VPN, usługi streamingu na całym świecie, blokowanie reklam oraz złośliwego oprogramowania i wiele więcej."]},"vpn_servers":{"Get Proton VPN Plus":["Wybierz plan Proton VPN Plus"]},"wallet_signup_2024:Action":{"Get Proton Wallet":["Wybierz Proton Wallet"]},"wallet_signup_2024:Homepage hero product link title":{"Wallet":["Portfel"]},"wallet_signup_2024:Homepage product navigation bar":{"Wallet":["Portfel"]},"wallet_signup_2024:menu item":{"Bitcoin guide":["Przewodnik po systemie Bitcoin"],"Proton Wallet news":["Aktualności Proton Wallet"],"Proton Wallet support":["Wsparcie dla Proton Wallet"]},"wallet_signup_2024:Pricing":{"Includes everything in Proton Unlimited and":["Zawiera wszystko, co Proton Unlimited oraz"],"Limited availability":["Ograniczona dostępność"],"The easiest way to securely own, send, and receive Bitcoin":["Najprostszy sposób na bezpieczne przechowywanie, wysyłanie i odbieranie waluty Bitcoin"]},"wallet_signup_2024:ProductRange":{"Discover Proton Wallet":["Odkryj rozwiązanie Proton Wallet"],"Store and transact Bitcoin privately with an encrypted self-custody wallet.":["Bezpiecznie przechowuj i przesyłaj Bitcoiny dzięki szyfrowanemu portfelowi typu self-custody."]},"wallet_signup_2024:wallet bitcoin":{"Learn about Bitcoin, the Internet's value network.":["Dowiedz się więcej o internetowym systemie gotówkowym Bitcoin."]},"wallet_signup_2024:wallet overview":{"Ensure you're always in control of your Bitcoin.":["Miej pełny nadzór nad swoimi Bitcoinami."]},"wallet_signup_2024:wallet security":{"The encrypted, open-source wallet that puts you in control.":["Szyfrowany portfel o otwartym kodzie źródłowym, który daje Ci pełną kontrolę."]}}},"base":"blog","cdn":{"enabledForAssets":true,"enabledForImages":true,"url":"https://pmecdn.protonweb.com/"},"unleashApi":"https://account.proton.me/api"};
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DMARC is an email authentication method that verifies a message came from a legitimate sender. Learn how it works and why you need it to improve the deliverability of your emails and protect your domain.
Building on the DKIM and SPF authentication protocols, DMARC helps prevent your email domain from being forged (spoofed) and used for spam or phishing attacks.
We explain DMARC, how it works together with SPF and DKIM, and why you need it to protect your domain and make sure your emails are delivered.
DMARC (Domain-based Message Authentication, Reporting, and Conformance) is an open standard for email authentication that helps to prevent fraudsters from forging (spoofing) your domain.
Spammers and scammers can forge the From address of emails so they appear to come from a sender at your domain (for example, name@yourdomain.com).
DMARC checks that the From field matches the domain in DKIM and SPF authentication checks, helping internet service providers (ISPs) and email providers spot spoofed addresses. DMARC also tells email servers how to handle messages that fail these checks and allows recipients to receive reports on emails that fail authentication.
What is DMARC used for?
Email providers and ISPs use DMARC with SPF and DKIM to identify spoofed addresses, helping them spot and prevent spam and phishing emails. For example, at Proton Mail, DMARC is one tool we use for anti-abuse and account security.
Email platforms also use DMARC to monitor and troubleshoot emails. With DMARC, you can request reports on messages that have failed SPF and DKIM to help you identify why emails aren’t being delivered. DMARC reports also show who is sending email from your domain to alert you to potential fraudsters abusing your domain.
How DMARC works with SPF and DKIM
DMARC works in conjunction with SPF and DKIM to verify that the sender of an email is genuine. Here’s how the three authentication methods work together:
SPF (Sender Policy Framework) verifies that an email has been sent from an IP address authorized to send emails from the sender’s domain.
DKIM (DomainKeys Identified Mail) cryptographically verifies that the sender’s address and message contents haven’t been changed in transit.
DMARC (Domain-based Message Authentication, Reporting, and Conformance) ensures that the domain in DKIM and SPF checks matches the sender’s domain in the From field. It also specifies how email servers should handle a message that fails both DKIM and SPF — accept, reject, or mark it as spam.
Although DMARC only requires either SPF or DKIM to work, we strongly recommend that everyone who uses a custom domain set up both SPF and DKIM with DMARC to ensure your emails are properly delivered.
DMARC works with SPF and/or DKIM to authenticate an email’s sender (From field) and tells mail servers how to route messages that fail both those checks. Here’s how it works:
After setting up SPF and/or DKIM, you must publish a DMARC record, which contains a DMARC policy. The DMARC policy tells email servers what action to take with messages that fail both SPF and DKIM checks. There are three options:
DMARC policy
Server action
None
Take no action — the message continues to the recipient’s inbox.
Quarantine
Move the message to spam or another folder instead of the inbox.
Reject
Block the message — the message isn’t delivered
DMARC policy options
Whatever DMARC policy you set, email services may adapt their actions to optimize deliverability. For example, since there are still cases where legitimate emails fail DMARC, at Proton Mail, we don’t block messages with a “reject” DMARC policy but send them to the spam folder with a warning to the user.
Once you’ve published your DMARC record, you’re ready to send emails with DMARC as follows:
You send an email, for example, from the address you@yourdomain.com.
The receiving mail server looks up your domain’s DMARC policy in your DMARC record on the DNS server.
Following the DMARC policy, the receiving mail server does the DMARC, SPF, and DKIM authentication tests, checking that the domain in the message’s From field is “aligned with” (matches) the domain in SPF and DKIM.
For SPF, the From field should align with the domain in the Return-Path field in the email header.
For DKIM, the From field should align with the domain (d) in the DKIM signature.
If the message passes both the authentication and the alignment test for either SPF or DKIM, then it passes DMARC. If it fails either the authentication or the alignment test for both SPF and DKIM, it fails DMARC.
When a message fails DMARC, the mail server routes it according to the DMARC policy (none/quarantine/reject).
Mail servers receiving messages from your domain send regular emails with authentication results to you, the domain owner (assuming you’ve included a reporting address in your DMARC record and the mail server is set up to send DMARC reports).
What is a DMARC policy?
A DMARC policy enables a domain owner to specify what a receiving mail server should do with emails that fail DMARC, in other words, fail both SPF and DKIM.
There are three options for DMARC policies, which are indicated by the “p=” tag in a DMARC record:
p=none: Take no action, so all messages that fail authentication will be delivered.
p=quarantine: Send failed messages to the spam folder.
p=reject: Block failed messages, so they won’t be delivered.
p=none may be useful when you have a new domain and want to check that your legitimate emails are being delivered. With p=none, all messages are delivered regardless of authentication, and you receive email reports that you can use to spot authentication issues.
However, once you’re confident your email is configured correctly, we recommend switching to p=quarantine, which sends failed messages to the spam folder.
If you think you’re likely to be the target of email spoofing, set p=reject. For example, sites like PayPal and eBay use p=reject because they’re targeted by spammers and scammers impersonating their domains.
What is a DMARC record?
A DMARC record is a type of DNS text record(nowe okno) that tells receiving mail servers that a domain is protected by DMARC authentication. Typically, DMARC records include:
A DMARC policy, which tells receiving mail servers what to do when an email fails SPF and DKIM authentication
An optional email address where mail servers can send DMARC reports about the authentication of emails sent from that domain.
A DMARC record consists of a series of tags, like v=DMARC1, p=quarantine, etc.
DMARC record example
Here’s an example of a DMARC record with an explanation of what the tags mean below:
v=DMARC1: The DMARC version number. Every DMARC record must begin with this tag.
p=quarantine: The DMARC policy, which instructs the receiving mail server to send messages that fail DMARC to the spam folder. This value can also be p=none or p=reject (learn more about DMARC policies above).
rua=you@yourdomain.com: Specifies the address to receive DMARC aggregate reports, which give you a statistical overview of all your domain’s email traffic. You can also use the tag ruf= (for example, ruf=you@yourdomain.com) to receive more detailed, forensic DMARC reports about the authentication status of your emails.
There are 11 different tags that can be added to a DMARC record, but only v and p are required.
Other common tags are adkim and aspf, which specify how strictly the domain in the From field must align with the domain in DKIM and SPF checks (see how DMARC works above for details). The value can be either “strict” (s), which requires an exact match, or “relaxed” (r), which permits subdomains.
For example, if you set the value adkim=s for your domain (yourdomain.com), only emails sent from @yourdomain.com will pass DMARC. But if you change this value to adkim=r, emails sent from subdomains, like @news.yourdomain.com or @info.yourdomain.com, will also pass.
If you want to maintain strict alignment and allow subdomains, you can simply add a separate DMARC record for each subdomain.
Why use DMARC?
If you have your own domain, we strongly recommend setting up DMARC, together with SPF and DKIM. Here’s why:
Protect your domain
DMARC authenticates the sender’s address in your emails, making it harder for fraudsters to impersonate your domain. So implementing DMARC helps prevent attackers from using your domain for spam or phishing attacks.
Improve email deliverability
Emails sent with DMARC look legitimate and can be easily verified. So implementing DMARC reduces the chances of your emails ending up in the spam folder. And the more you send authenticated emails, the more you build your domain’s sending reputation with email service providers over the long term.
Troubleshoot emails
With DMARC, you can receive regular reports letting you monitor the authentication of your emails and track who is sending emails. That way, you can fix any authentication issues and spot spammers or fraudsters abusing your domain.
Easily set up DMARC with Proton Mail
Using DMARC with SPF and DKIM is the most effective way to prevent your domain from being abused for spam or phishing attacks. However, setting up DMARC can be tricky, as it depends on the successful implementation of SPF and/or DKIM to work.
If you have a business, you can easily set up DMARC to protect your brand’s domain with Proton for Business. Or if you’re just looking to try secure, private email, get Proton Mail for free.
Do you have an incident response plan to protect your business from financial
and reputational damage? Find out how Proton Pass for Business can help you stay
safe.