all-in-one privacy solution":["Proton Unlimited è una soluzione completa per la privacy"],"Black Friday":["Black Friday"],"No ads. Privacy by default.":["Niente pubblicità. La prima regola è la privacy."],"People before profits":["Le persone prima dei profitti"],"Security through transparency":["Più sicurezza grazie alla trasparenza"],"The best Proton Mail ${ BLACK_FRIDAY } deals":["Le migliori offerte di Proton Mail per il ${ BLACK_FRIDAY }"],"The world’s only community- supported email service":["L'unico servizio di posta elettronica al mondo supportato dalla community"]},"specialoffer:limited":{"${ hours } hour":["${ hours } ora","${ hours } ore"],"${ hoursLeft }, ${ minutesLeft } and ${ secondsLeft } left":["Restano ${ hoursLeft }, ${ minutesLeft } e ${ secondsLeft }"],"${ minutes } minute":["${ minutes } minuto","${ minutes } minuti"],"${ seconds } second":["${ seconds } secondo","${ seconds } secondi"],"Limited time offer":["Offerta a tempo limitato"]},"specialoffer:listitem":{"Create multiple addresses":["Crea indirizzi multipli"],"Hide-my-email aliases":["Alias hide-my-email"],"Quickly unsubscribe from newsletters":["Annulla rapidamente l'iscrizione alle newsletter"],"Use your own domain name":["Utilizza il tuo nome di dominio"]},"specialoffer:logos":{"As featured in":["Ne hanno parlato"]},"specialoffer:metadescription":{"Get an encrypted email that protects your privacy":["Scegli un'email cifrata per proteggere la tua privacy"]},"specialoffer:metatitle":{"Proton Mail Black Friday Sale - Up to 40% off":["Offerta Black Friday di Proton Mail - sconti fino al 40%"]},"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.":["Per questo Black Friday ti offriamo fino al 40% di sconto sugli abbonamenti a Proton Mail. Scopri le straordinarie offerte sui piani di abbonamento alla nostra email dotata di crittografia end-to-end."]},"specialoffer:newmetatitle":{"Proton Mail Black Friday sale | Up to 40% off secure email":["Offerta di Proton Mail per il Black Friday | Fino al 40% di sconto sulla nostra email sicura"]},"specialoffer:note":{"* Billed at ${ TOTAL_SUM } for the first year":["* Addebito di ${ TOTAL_SUM } per il primo anno"],"*Billed at ${ TOTAL_SUM } for the first 2 years":["*Addebito di ${ TOTAL_SUM } per i primi 2 anni"],"30-day money-back guarantee":["Garanzia soddisfatti o rimborsati di 30 giorni"],"Billed at ${ TOTAL_SUM } for the first 2 years":["Addebito di ${ TOTAL_SUM } per i primi 2 anni"],"Billed at ${ TOTAL_SUM } for the first year":["Addebito di ${ TOTAL_SUM } per il primo anno"],"You save ${ SAVE_SUM }":["Risparmi ${ SAVE_SUM }"]},"specialoffer:off":{"${ DISCOUNT } off":["−${ DISCOUNT }"],"${ PERCENT_OFF } off":["−${ PERCENT_OFF }"]},"specialoffer:testimonial":{"I love my ProtonMail":["Adoro ProtonMail"],"My favorite email service":["Il mio servizio email preferito"],"Thanks Proton for keeping us all safe in the complicated internet universe.":["Grazie Proton perché ci proteggi nell'universo complicato di 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":["Ottieni quello per cui hai pagato. Nel caso di big tech, se non paghi niente, vieni usato. Ho smesso di usare Gmail e sono passata a @ProtonMail"]},"specialoffer:time":{"Days":["Giorni"],"Hours":["Ore"],"Min":["Min"]},"specialoffer:title":{"And much more":["E molto altro"],"Make your inbox yours":["Personalizza la tua casella di posta"],"Safe from trackers":["Protezione dai tracker"],"Stay organized":["Mantieni tutto organizzato"],"Black Friday email deals":["Offerte email del Black Friday"],"Don’t just take our word for it":["Non lo diciamo solo noi"],"Our story":["La nostra storia"],"Transfer your data from Google in one click":["Trasferisci i tuoi dati da Google con un solo 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.":["Accedi a contenuti bloccati e naviga in modalità privata. Include ${ TOTAL_SERVERS } server in più di ${ TOTAL_COUNTRIES } Paesi, possibilità di connettere fino a 10 dispositivi, accesso a servizi di streaming in tutto il mondo, blocco di malware e adblocker, e altro ancora."],"Easily share your calendar with your family, friends or colleagues, and view external calendars.":["Condividi facilmente il tuo calendario con familiari, amici o colleghi e visualizza calendari esterni."],"Includes support for 1 custom email domain, 10 email addresses, 10 hide-my-email aliases, calendar sharing, and more.":["Include il supporto per 1 dominio email personalizzato, 10 indirizzi email, 10 alias hide-my-email, condivisione del calendario e altro ancora."],"Includes support for 3 custom email domains, 15 email addresses, unlimited hide-my-email aliases, calendar sharing, and more.":["Include il supporto per 3 domini email personalizzati, 15 indirizzi email, alias hide-my-email illimitati, condivisione del calendario e altro ancora."],"Manage up to 25 calendars, mobile apps, secured with end-to-end encryption, 1-click calendar import from Google, and more.":["Gestisci fino a 25 calendari, app per dispositivi mobili, protezione con la crittografia end-to-end, importazione del calendario da Google in un solo clic e altro ancora."]},"Status Banner":{"At the moment we are experiencing issues with the Proton VPN service":["Al momento abbiamo dei problemi con il servizio di Proton VPN"],"Learn more":["Scopri di più"]},"Status banner":{"Learn more":["Scopri di più"],"Please note that at the moment we are experiencing issues with the ${ issues[0] } service.":["Attenzione: stiamo riscontrando dei problemi con il servizio di ${ issues[0] }"],"We are experiencing issues with one or more services at the moment.":["Stiamo riscontrando dei problemi con uno o più servizi."]},"suggestions":{"Suggestions":["Suggerimenti"]},"Support":{"Sub category":["Sottocategoria","Sottocategorie"]},"Support article":{"${ readingTime } min":["${ readingTime } minuto","${ readingTime } minuti"],"Category":["Categoria","Categorie"],"Didn’t find what you were looking for?":["Non hai trovato quello che cercavi?"],"General contact":["Contatti generali"],"Get help":["Ottieni supporto"],"Legal contact":["Contatti legali"],"Media contact":["Contatti per la stampa"],"Partnerships contact":["Contatti per collaborazioni"],"Reading":["Lettura"]},"Support categories":{"Browse Proton product support":["Consulta l'assistenza sui prodotti Proton"]},"Support category":{"There is no article in this category yet.":["Per ora non ci sono articoli in questa categoria."]},"Support troubleshooting":{"--- Select ---":["--- Seleziona ---"],"App version":["Versione dell'app"],"Browser":["Browser"],"Check if this helps":["Verifica se questo ti è utile"],"Choose a category for your question":["Scegli una categoria per la tua domanda"],"Choose a product":["Scegli un prodotto"],"Did this solve your issue ?":["Ti ha risolto il problema?"],"Faster assistance is just a few clicks away — please make your selections":["Ottieni assistenza più velocemente con pochi clic. Fai la tua selezione"],"No, contact support":["No, contatta il supporto"],"Proton account":["Account 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":["Grazie per il feedback"],"Troubleshooting":["Risoluzione dei problemi"],"What can we help with ?":["In cosa possiamo esserti di aiuto?"],"Yes":["Sì"]},"support_modal_search_query":{"Search query":["Query di ricerca"]},"support_search_button":{"Search":["Cerca"]},"support_search_i_am_looking_for":{"I'm looking for":["Sto cercando"]},"SupportForm":{"For a faster resolution, please report the issue from the Bridge app: Help > Report a problem.":["Per una risoluzione più rapida, segnala il problema dall'app Bridge: Aiuto > Segnala un problema."],"Information":["Informazioni"]},"SupportForm:option":{"Account Security":["Sicurezza dell'account"],"Contacts":["Contatti"],"Custom email domain":["Dominio email personalizzato"],"Email delivery and Spam":["Consegna delle email e spam"],"Encryption":["Crittografia"],"Login and password":["Login e password"],"Merge aliases and accounts":["Unione di alias e account"],"Migrate to Proton":["Migrazione a Proton"],"Notifications":["Notifiche"],"Other":["Altro"],"Plans and billing":["Piani e fatturazione"],"Proton for Business":["Proton for Business"],"Sign up":["Iscrizione"],"Storage":["Archiviazione"],"Users, addresses, and identities":["Utenti, indirizzi e identità"]},"SupportForm:optionIntro":{"Select a topic":["Seleziona un argomento"]},"swiss_baseed_feature":{"Swiss based":["Con sede in Svizzera"]},"Testimonial":{"Awards":["Premi"],"Customers":["Clienti"],"Featured":["In evidenza"],"Go to testimonial source":["Vai alle testimonianze"],"Reviews":["Recensioni"],"Videos":["Video"]},"Text":{"Find the plan that's right for you":["Trova il piano che fa per te"],"If you need help, check out our ${ supportLink }.":["Se ti serve assistenza dai un’occhiata alla nostra ${ supportLink }."],"The page you’re looking for might have been removed, or it could be an\nold link.":["La pagina che stai cercando potrebbe essere stata rimossa, o il link potrebbe essere vecchio."]},"Title":{"On this page":["In questa pagina"],"Related articles":["Articoli correlati"],"Share ${ thisPage }":["Condividi ${ thisPage }"],"Thank you!":["Grazie"],"this page":["questa pagina"]},"Tooltip":{"More information":["Ulteriori informazioni"]},"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.":["Puoi creare fino a 20 calendari cifrati personalizzati e condivisibili. Puoi inoltre aggiungere fino a 5 calendari di amici, familiari, colleghi e organizzazioni."]},"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.":["Accedi a contenuti bloccati e naviga in modalità privata. Il piano include più di ${ TOTAL_SERVERS } server in oltre ${ TOTAL_COUNTRIES } Paesi, massima velocità della VPN, ${ TOTAL_VPN_CONNECTIONS } connessioni alla VPN, servizi di streaming in tutto il mondo, anti-malware, ad-blocker e altro ancora."],"Access blocked content and browse privately. 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Proton Mail employs different methods to protect your privacy and your security. One method of protecting messages from being read by outsiders is encryption. However, encryption alone does not protect you from all security vulnerabilities. For instance, if john@example.com sends you an email, how do you know if John actually sent you the message and not some malicious outsider? Encryption will protect the confidentiality of messages after it is sent, yet gives no assurances about who sent the email.
To verify the identity of the sender, Proton Mail uses digital signatures, which are like physical signatures on a specific message, ensuring that the message cannot be changed or tampered with after it is signed.
If you are using the Address Verification with Trusted Keys feature, then Proton Mail will notify you if a digital signature check fails via the “Sender Verification Failed” error message. This article provides more details about what this message means.
Signature verification on messages
When trusted keys are available for a contact’s email address, signatures on messages are automatically verified by Proton Mail when an email or an attachment from that sender is opened. To see whether the message sent has a valid signature you can look at the sender’s address. A warning sign indicates an invalid signature:
We will explain later in this article what this means.
Signature verification on attachments
Attachments can also be signed. If a contact’s email has Address Verification with Trusted Keys enabled, you can be sure that the attachment you received actually came from them and has not been tampered with in transit. In contrast to messages, the signature status cannot always be shown immediately after opening the message. It is necessary to download the attachment first before we can verify it. While some attachments (such as embedded images) are downloaded automatically, you usually have to download the attachments manually before signature verification can occur.
As soon as the attachment has been downloaded for the first time a status icon will be shown if there is a signature. On attachments that failed signature verification, you will see a warning icon.
Does an invalid signature always mean someone tampered with my data?
There are a number of possible explanations. The most common reasons are:
1) The sender has reset their password, which always generates new encryption keys for that address. Because the new encryption key is not trusted, Sender Verification Failed will be displayed. After you trust the contact’s new key, Sender Verification will succeed. Of course, you should verify with the sender that they actually did reset their password before you trust the new key.
2) The sender has generated a new encryption key. If the sender has generated a new encryption key and is sending messages with that new key, then Sender Verification will fail because this key is not trusted. In this case, you should verify with the sender that they did change their encryption key before trusting the new key.
If you get the Sender Verification Failed error, but the sender did not reset password or generate a new encryption key, it could mean that the sender’s account has been compromised or that the email sent to you has been tampered with. In this case, you should not trust the email until confirming the contents of the email with the sender through some other channel. If you have questions, you can reach our security team at security@proton.me.