all-in-one privacy solution":["O Proton Unlimited é uma solução única de privacidade"],"Black Friday":["Black Friday"],"No ads. Privacy by default.":["Sem anúncios. Privacidade por padrão."],"People before profits":["Pessoas acima do lucro"],"Security through transparency":["Segurança por meio da transparência"],"The best Proton Mail ${ BLACK_FRIDAY } deals":["As melhores ofertas de ${ BLACK_FRIDAY } do Proton Mail"],"The world’s only community- supported email service":["O único serviço de e-mail do mundo apoiado pela comunidade"]},"specialoffer:limited":{"${ hours } hour":["${ hours } hora","${ hours } horas"],"${ hoursLeft }, ${ minutesLeft } and ${ secondsLeft } left":["${ hoursLeft }, ${ minutesLeft }, e ${ secondsLeft } restantes"],"${ minutes } minute":["${ minutes } minuto","${ minutes } minutos"],"${ seconds } second":["${ seconds } segundo","${ seconds } segundos"],"Limited time offer":["Oferta por tempo limitado"]},"specialoffer:listitem":{"Create multiple addresses":["Crie vários endereços"],"Hide-my-email aliases":["Use aliases do hide-my-email"],"Quickly unsubscribe from newsletters":["Cancele a assinatura de newsletters rapidamente"],"Use your own domain name":["Use seu próprio nome de domínio"]},"specialoffer:logos":{"As featured in":["Destaques"]},"specialoffer:metadescription":{"Get an encrypted email that protects your privacy":["Obtenha um e-mail criptografado que proteja sua privacidade"]},"specialoffer:metatitle":{"Proton Mail Black Friday Sale - Up to 40% off":["Oferta de Black Friday do Proton Mail - Até 40% de desconto"]},"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.":["Obtenha até 40% de desconto nas assinaturas do Proton Mail nesta Black Friday. Confira ótimas ofertas em nossos planos de e-mail seguro com criptografia de ponta a ponta."]},"specialoffer:newmetatitle":{"Proton Mail Black Friday sale | Up to 40% off secure email":["Oferta de Black Friday do Proton Mail - Até 40% de desconto no e-mail protegido"]},"specialoffer:note":{"* Billed at ${ TOTAL_SUM } for the first year":["* Com o preço de ${ TOTAL_SUM } no primeiro ano"],"*Billed at ${ TOTAL_SUM } for the first 2 years":["*Com o preço de ${ TOTAL_SUM } nos primeiros dois anos"],"30-day money-back guarantee":["Garantia de reembolso de 30 dias"],"Billed at ${ TOTAL_SUM } for the first 2 years":["Com o preço de ${ TOTAL_SUM } nos primeiros dois anos"],"Billed at ${ TOTAL_SUM } for the first year":["Com o preço de ${ TOTAL_SUM } no primeiro ano"],"You save ${ SAVE_SUM }":["Economize ${ SAVE_SUM }"]},"specialoffer:off":{"${ DISCOUNT } off":["-${ DISCOUNT }"],"${ PERCENT_OFF } off":["-${ PERCENT_OFF }"]},"specialoffer:testimonial":{"I love my ProtonMail":["Adoro ProtonMail"],"My favorite email service":["Meu serviço favorito de e-mail"],"Thanks Proton for keeping us all safe in the complicated internet universe.":["Agradecemos ao Proton por nos manter a salvo no complicado universo da 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":["Você recebe pelo que paga. No caso das grandes tecnologias, você se acostuma quando não paga nada. Parei de usar o Gmail e troquei para o @ProtonMail"]},"specialoffer:time":{"Days":["Dias"],"Hours":["Horas"],"Min":["Min"]},"specialoffer:title":{"And much more":["E muito mais"],"Make your inbox yours":["Deixe a caixa de entrada do seu jeito"],"Safe from trackers":["A salvo de rastreadores"],"Stay organized":["Mantenha-se organizado"],"Black Friday email deals":["Ofertas de e-mail da Black Friday"],"Don’t just take our word for it":["Não confie apenas em nossa palavra"],"Our story":["Nossa história"],"Transfer your data from Google in one click":["Transfira seus dados do Google com um clique"]},"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.":["Acesse conteúdo bloqueado e navegue com privacidade. Inclui ${ TOTAL_SERVERS } servidores em +${ TOTAL_COUNTRIES } países, conecte até 10 dispositivos, acesse serviços de streaming do mundo todo, malware e bloqueador de anúncios e muito mais."],"Easily share your calendar with your family, friends or colleagues, and view external calendars.":["Compartilhe facilmente seus calendários com amigos, familiares ou colegas e visualize calendários externos."],"Includes support for 1 custom email domain, 10 email addresses, 10 hide-my-email aliases, calendar sharing, and more.":["Inclui suporte para 1 domínio de e-mail personalizado, 10 endereços de e-mail, 10 aliases do hide-my-email, compartilhamento de calendário e muito mais."],"Includes support for 3 custom email domains, 15 email addresses, unlimited hide-my-email aliases, calendar sharing, and more.":["Inclui suporte para 3 domínios de e-mail personalizados, 15 endereços de e-mail, aliases ilimitados do hide-my-email, compartilhamento de calendário e muito mais."],"Manage up to 25 calendars, mobile apps, secured with end-to-end encryption, 1-click calendar import from Google, and more.":["Gerencie até 25 calendários, apps para dispositivos móveis, protegidos com criptografia de ponta a ponta, importação de calendário com 1 clique do Google e muito mais."]},"Status Banner":{"At the moment we are experiencing issues with the Proton VPN service":["No momento estamos enfrentando problemas com o serviço Proton VPN"],"Learn more":["Saiba mais"]},"Status banner":{"Learn more":["Saiba mais"],"Please note that at the moment we are experiencing issues with the ${ issues[0] } service.":["No momento, estamos com problemas no serviço ${ issues[0] }."],"We are experiencing issues with one or more services at the moment.":["No momento, estamos com problemas em um ou mais serviços."]},"suggestions":{"Suggestions":["Sugestões"]},"Support":{"Sub category":["Subcategoria","Subcategorias"]},"Support article":{"${ readingTime } min":["${ readingTime } min","${ readingTime } min"],"Category":["Categoria","Categorias"],"Didn’t find what you were looking for?":["Não encontrou o que procura?"],"General contact":["Contato geral"],"Get help":["Obter ajuda"],"Legal contact":["Contato jurídico"],"Media contact":["Contato de mídia"],"Partnerships contact":["Contato de parcerias"],"Reading":["Leitura"]},"Support categories":{"Browse Proton product support":["Navegar pelo suporte a produtos da Proton"]},"Support category":{"There is no article in this category yet.":["Ainda não há nenhum artigo nesta categoria."]},"Support troubleshooting":{"--- Select ---":["--- Selecionar ---"],"App version":["Versão do aplicativo"],"Browser":["Navegador"],"Check if this helps":["Confira se isso ajuda"],"Choose a category for your question":["Escolha uma categoria para sua pergunta"],"Choose a product":["Selecione um produto"],"Did this solve your issue ?":["Isso resolveu seu problema?"],"Faster assistance is just a few clicks away — please make your selections":["Assistência mais rápida está a apenas alguns cliques de distância — faça suas seleções"],"No, contact support":["Não, entrar em contato com o suporte"],"Proton account":["Conta 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":["Agradecemos pelo feedback"],"Troubleshooting":["Solução de problemas"],"What can we help with ?":["Como podemos ajudar você?"],"Yes":["Sim"]},"support_modal_search_query":{"Search query":["Consulta de pesquisa"]},"support_search_button":{"Search":["Pesquisar"]},"support_search_i_am_looking_for":{"I'm looking for":["Estou procurando"]},"SupportForm":{"For a faster resolution, please report the issue from the Bridge app: Help > Report a problem.":["Para uma resolução mais rápida, informe o problema no aplicativo Bridge: Ajuda > Comunicar um problema."],"Information":["Informações"]},"SupportForm:option":{"Account Security":["Segurança da conta"],"Contacts":["Contatos"],"Custom email domain":["Domínio de e-mail personalizado"],"Email delivery and Spam":["Entrega de e-mail e spam"],"Encryption":["Criptografia"],"Login and password":["Início de sessão e senha"],"Merge aliases and accounts":["Combinar alias e contas"],"Migrate to Proton":["Migrar para a Proton"],"Notifications":["Notificações"],"Other":["Outros"],"Plans and billing":["Planos e faturamento"],"Proton for Business":["Proton for Business"],"Sign up":["Criar conta"],"Storage":["Armazenamento"],"Users, addresses, and identities":["Usuários, endereços e identidades"]},"SupportForm:optionIntro":{"Select a topic":["Selecione um tópico"]},"swiss_baseed_feature":{"Swiss based":["Sediado na Suíça"]},"Testimonial":{"Awards":["Prêmios"],"Customers":["Clientes"],"Featured":["Em destaque"],"Go to testimonial source":["Ir para a página inicial de depoimentos"],"Reviews":["Avaliações"],"Videos":["Vídeos"]},"Text":{"Find the plan that's right for you":["Encontre o plano certo para você"],"If you need help, check out our ${ supportLink }.":["Se precisar de ajuda, confira nossa ${ supportLink }."],"The page you’re looking for might have been removed, or it could be an\nold link.":["É possível que a página que você está procurando tenha sido removida ou seja um\nlink antigo."]},"Title":{"On this page":["Nesta página"],"Related articles":["Artigos relacionados"],"Share ${ thisPage }":["Compartilhar ${ thisPage }"],"Thank you!":["Obrigado!"],"this page":["esta página"]},"Tooltip":{"More information":["Mais informações"]},"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.":["Crie até 20 calendários compartilháveis personalizados e criptografados. Além disso, é possível adicional até 5 calendários de amigos, família, colegas e organizações."]},"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.":["Acesse conteúdo bloqueado e navegue com privacidade. Inclui mais de ${ TOTAL_SERVERS } servidores em mais de +${ TOTAL_COUNTRIES } países, VPN com a mais alta velocidade, ${ TOTAL_VPN_CONNECTIONS } conexões VPN, serviços de streaming no mundo todo, malware e bloqueador de anúncios e muito mais."],"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.":["Acesse conteúdo bloqueado e navegue com privacidade. Inclui mais de ${ TOTAL_SERVERS } servidores em mais de +${ TOTAL_COUNTRIES } países, VPN com a mais alta velocidade, 10 conexões VPN, serviços de streaming no mundo todo, malware e bloqueador de anúncios e muito mais."]},"version_history_label":{"Version history":["Histórico de versões"]},"version_history_tooltip":{"Store up to ${ versionHistoryNumber } versions of each file for up to ${ years } years":["Armazene até ${ versionHistoryNumber } versões de cada arquivo por até ${ years } anos"]},"vpn_features_link":{"View VPN plans":["Visualizar planos de VPN"]},"vpn_features_useCase":{"Access blocked content and browse privately":["Acesse conteúdo bloqueado e navegue com privacidade"]}}},"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;
})();
Sender Policy Framework (SPF) is an email authentication method that verifies that a message has been sent from an authorized mail server. Learn how it works and how it helps to protect your email domain.
Used with DKIM and DMARC(new window), SPF is one of the main ways internet service providers (ISPs) and email platforms identify and block spam and phishing attacks.
We explain SPF, how it works, and why you need it to help protect your domain and ensure your messages are delivered.
Sender Policy Framework (SPF) is an email authentication protocol that allows you to specify the servers authorized to send mail from your domain, making it harder for fraudsters to spoof (forge) your address.
If you send email from a custom domain (for example, @yourdomain.com), you can list the IP addresses(new window) of the mail servers authorized to send your mail. By checking your list of IP addresses, email services and ISPs can identify whether the message came from a trusted server.
What is SPF used for?
SPF is one of the main methods email servers use to authenticate emails. It helps email providers identify spoofed addresses and block spam and phishing emails.
However, SPF alone isn’t enough to spot spoofed messages because the sender’s address (From field) can be forged. By using SPF with DKIM and DMARC, email providers can verify that the sender’s domain matches the From field, confirming that the address isn’t spoofed.
How SPF differs from DKIM and DMARC
SPF, DKIM, and DMARC are email authentication protocols that are used to verify that emails are sent from a legitimate sender, but they all work differently. Here’s how they 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 service providers should deliver a message that fails both DKIM and SPF — accept, reject, or mark it as spam.
SPF checks whether an incoming email has been sent from a mail server authorized to send mail from that domain.
First, you must create an SPF record that lists the IP addresses of the mail servers authorized to send mail from your domain. Then you’re ready to send messages with SPF as follows:
You send an email, for example, from the address you@yourdomain.com. Suppose the message is sent from one of your authorized email servers with the IP address 185.70.40.111.
When the email arrives, the receiving mail server checks the sender’s address in the Return-Path (also known as MAIL FROM) field of the email header and looks up the SPF record for your domain (in this example, yourdomain.com).
The receiving mail server checks whether the IP address from which the mail was sent (185.70.40.111) is listed in your SPF record.
If the IP address is listed, the message passes SPF; if it isn’t, it fails.
Note that in step 2. the receiving mail server looks up the SPF record for the domain in the Return-Path field, which doesn’t need to be the same as the domain in the From field. Even if the domain in the From address is spoofed and differs from that in the Return-Path, a message can pass SPF.
That’s why you need DMARC to verify that the domain in the SPF and DKIM checks matches the sender’s address in the From field.
What is an SPF record?
An SPF record is a type of DNS text record(new window) that lists the IP addresses of the servers authorized to send email from a particular domain. SPF records are published on the domain’s DNS server, so any receiving mail server can look up the list to check whether an email has been sent from a trusted server.
SPF record example
Here’s an example of an SPF record with an explanation of what it means below:
v=spf1: The SPF version number. Every SPF record must begin with this tag.
ip4: The IP address(es) of the servers authorized to send email from your domain. They can be IPv4 or IPv6 addresses(new window); IPv6 addresses use the tag ip6.
include: Instructs the server to check the SPF records of the additional domain mentioned. In this example, the server would look up _spf.protonmail.ch and add the IP addresses found there to the list of authorized addresses.
mx: Any IP addresses that match the mail servers listed in the MX records(new window) of the sending domain. For example, Proton Mail uses mail.protonmail.ch and mailsec.protonmail.ch.
~all: Tells receiving email servers what to do if an email doesn’t pass SPF. The three most common all tags are:
~all: Mark the message as suspicious
–all: Reject the message
?all: Receiving email server decides (neutral recommendation)
However, since the introduction of DMARC, many email providers, including Proton Mail, no longer use these all tags. Apart from checking that the From field matches the domain in SPF and DKIM checks, DMARC tells servers what to do with messages that fail these checks, making the all tags redundant.
In the example above, the SPF record authorizes mail to be sent from:
185.70.40.111
The IP addresses found in _spf.protonmail.ch
The IP addresses of the mail servers listed in the domain’s MX records
If an email from this domain is received from an IP address not listed above, the message fails SPF and is treated as suspicious.
SPF and mail forwarding
One limitation of SPF is that it doesn’t work reliably with forwarded emails.
When forwarding a message, if the sending mail server replaces the original sender’s email address in the Return-Path (MAIL FROM) field with the forwarder’s address, the receiving server will check the SPF record of the forwarder’s domain. In this case, the message should pass SPF.
But not all email platforms rewrite the Return-Path field when forwarding. If the mail server preserves the original sender’s address in the Return-Path field, the receiving mail server will check the original sender’s SPF record. As this doesn’t include the IP address of the forwarding server, the message fails.
Fortunately, if an email fails SPF, it may still pass the DKIM check because DKIM verifies a message’s content, not its sending IP address. As long as you don’t change the content and structure of the original message, it should pass DKIM.
Why use SPF?
Along with DKIM and DMARC, SPF is one of the main ways you can protect your domain and ensure your emails get delivered. Here’s why you should use it:
Beat spammers and scammers
SPF makes it harder for cybercriminals to send messages pretending to be from your domain (email spoofing). Specifying trusted mail servers with SPF helps to prevent fraudsters from using your domain for spam and phishing attacks.
Improve email deliverability
SPF helps ISPs and email platforms identify legitimate emails. So using SPF increases the chances of your messages being delivered instead of ending up in the spam folder.
Boost your domain reputation
The more your emails pass authentication checks like SPF, the more you improve your domain’s reputation with email platforms. So SPF can help improve your emails’ deliverability in the long run.
Easy SPF authentication with Proton Mail
If you have your own domain, we strongly recommend setting up SPF, together with DKIM and DMARC, to improve your email security and deliverability.
Get Proton Mail Plus for a single domain, or get Proton Unlimited with support for three domains, 15 addresses, 500 GB of storage, and unlimited hide-my-email aliases.
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