Backup & Email
Proton Mail
End-to-end encrypted mail used where message confidentiality and jurisdiction are explicit requirements rather than preferences.
Capabilities
What we implement
- Custom domain and mailbox setup
- Bridge configuration for desktop clients
- SPF, DKIM and DMARC alignment
- Migration planning from existing providers
Security
How it is hardened
- Zero-access encryption at rest
- MFA and recovery-phrase handling procedure
- Documented limits of encryption when mailing external parties
Architecture
Proton Mail reference architecture
Encrypted mail with realistic boundaries: internal messages stay end-to-end encrypted, external mail relies on transport security and correct domain authentication.
02 · Organisation
Custom domainUser accountsAddresses & aliasesAdministrative accounts are separated from day-to-day mailboxes.
03 · Access
Web appMobile appsProton BridgeBridge is used where Outlook or Thunderbird must remain the client.
04 · Key handling
Zero-access encryptionRecovery phrase custodyMFARecovery material is documented and stored offline; losing it means losing the mailbox.
FAQ
Proton Mail questions we are asked
- Is all our mail encrypted end to end?
- Between Proton accounts, yes. Mail to external providers is encrypted in transit and at rest, but the recipient's provider can read it unless you use password-protected messages or PGP.
- Can we keep using Outlook?
- Yes, through Proton Bridge on each desktop. It decrypts locally and presents a standard IMAP/SMTP endpoint to the client.
- What is the main operational risk?
- Recovery. Zero-access encryption means the provider cannot restore an account for you, so recovery phrases must be held securely and tested.
Related
Other backup & email platforms
Proton Mail is referenced to describe engineering capability. All trademarks and product names are the property of their respective owners; no partnership or endorsement is implied.
Ready to scope the work?
Share your environment and objectives. You will get an engineering response covering scope, approach and considerations.