Migadu vs Proton Mail

Compare Migadu and Proton Mail on capabilities, jurisdiction, assurance, and fit for European buyers.

Both listed as alternatives to: Gmail, Google Workspace, Microsoft 365

Migadu

Switzerland· Email Services

Needs review

Shortlist Migadu when you need Swiss-operated, standards IMAP/SMTP hosting with unlimited addresses across many domains under flat account quotas—especially agencies and multi-domain SMEs. Skip when you need provider E2EE defaults, contractual SLA on the default offer, mailbox 2FA, or bulk/transactional sending; consider Proton Mail/Tuta for E2EE, or mailbox.org/Mailfence/Posteo/Runbox for other European professional-mail tradeoffs.

Swiss operatorUsage-priced multi-domainSMTP/IMAP/POP3Mail hosted in FranceMulti-admin + APINo ads / no tracking

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Proton Mail

Switzerland· Email Services

Needs review

Shortlist Proton Mail when you want Swiss-jurisdiction, zero-access encrypted email with open-source clients, custom domains, Bridge for desktop mailers, and a public DPA. Skip when you need free-tier IMAP Bridge, fully self-hosted FOSS mail on your own servers, or Workspace-class collaboration depth—consider Tuta, Posteo, or Mailfence among EU peers, or stay on Google/Microsoft if suite lock-in wins.

E2EE + zero-accessSwiss-operatedBridge (IMAP/SMTP)Open-source clientsISO 27001 & SOC 2 (claimed)Public B2B DPA

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Highlighted rows differ between the two products.

Migadu vs Proton Mail: Snapshot
Feature	Migadu	Proton Mail
Country of origin	Switzerland	Switzerland
Category	Email Services	Email Services
Open source	No	No
Self-hosted	No	No
Headquarters	Switzerland	Switzerland
Legal entity	Migadu-Mail GmbH	Proton AG, Route de la Galaise 32, 1228 Plan-les-Ouates, Geneva, Switzerland (EU representative: Proton Europe sàrl, Luxembourg)
Governing law	Canton of Appenzell Ausserrhoden, Swiss Confederation (terms)	Swiss law (Terms; Geneva courts for business/non-US consumer disputes as stated in Terms)
US parent / control	No known US parent	No known US parent
CLOUD Act exposure (indicative)	Medium	Medium
Hosting / residency	Mail servers stated in France (EU). Payment subprocessors Stripe and PayPal (US) for billing data. Full mail infrastructure/backup subprocessor list not published by name on primary pages.	Primary mail storage on Proton-owned servers in Switzerland (vendor security pages). Not marketed as AWS/GCP/Azure inbox hosting. Public privacy policy lists US-group processors for support and payments (Zendesk; Chargebee, Stripe, PayPal) and group support processing in North Macedonia and Taiwan; HubSpot noted for business sales inquiries.
Summary	Swiss-operated, standards-based email hosting for custom domains: unlimited addresses and multi-domain accounts priced by usage quotas, not per mailbox.	Swiss end-to-end encrypted email from Proton AG: zero-access inbox storage, open-source clients, custom domains, and Bridge for desktop IMAP clients.
Tags	privacy saas api email-hosting standards-based multi-domain	privacy saas encryption e2ee switzerland business free-tier open-source-clients

At a glance: Migadu vs Proton Mail
At a glance	Migadu	Proton Mail
HQ / entity	Migadu-Mail GmbH, Switzerland	Not listed
Founded	2014 (vendor About)	Not listed
Mail hosting	Data centers in France (vendor Pro/Cons)	Not listed
Commercial model	Flat per-account plans by daily message quotas + soft storage	Freemium + paid consumer and business seats
Open source product?	No — built on open-source stack; service is proprietary SaaS	Not listed
Self-host	No	No (SaaS); clients open source
Ownership	Bootstrapped; no outside capital (vendor claim)	Not listed
HQ	Not listed	Plan-les-Ouates (Geneva), Switzerland
Legal entity	Not listed	Proton AG (CHE-354.686.492); Proton Foundation supervision
Hosting model	Not listed	Proton-owned hardware in Switzerland (vendor claim)
Bridge	Not listed	Paid plans that include Mail

Key capabilities: Migadu vs Proton Mail
Key capabilities	Migadu	Proton Mail
Swiss operator	Yes	Not listed
Usage-priced multi-domain	Yes	Not listed
SMTP/IMAP/POP3	Yes	Not listed
Mail hosted in France	Yes	Not listed
Multi-admin + API	Yes	Not listed
No ads / no tracking	Yes	Not listed
E2EE + zero-access	Not listed	Yes
Swiss-operated	Not listed	Yes
Bridge (IMAP/SMTP)	Not listed	Yes
Open-source clients	Not listed	Yes
ISO 27001 & SOC 2 (claimed)	Not listed	Yes
Public B2B DPA	Not listed	Yes

Migadu

Usage-metered accounts with unlimited addresses
Plans are flat per Migadu account. Within daily in/out quotas and soft storage guidance, create large numbers of mailboxes and host many domains without per-address fees—useful for agencies and multi-project teams. Soft storage does not hard-bounce mail; sustained over-quota use can force upgrades or limits.
Standards SMTP, IMAP4, POP3, and webmail
No proprietary client protocol. Connect Thunderbird, Apple Mail, Outlook, mutt, and others over TLS (typical endpoints imap.migadu.com:993, smtp.migadu.com:465, pop.migadu.com:995). ManageSieve filtering, aliases, pattern rewrites, identities, footers, auto-responders, and optional catch-alls cover classic postmaster needs. Data remains portable via standard protocols.
Multi-domain admin, multi-admin, and beta API
Agencies can hold many client domains under one roof, open multiple administrators (domain-scoped on higher plans), set per-domain/mailbox limits, and monitor traffic. A REST API (documented as early beta) manages domains, mailboxes, identities, forwardings, aliases, and rewrites for automation. Domain deletion stays UI-only as a safety measure.
DNS helpers and postmaster-style support
Optional built-in DNS ships mail records preconfigured; Migadu also offers DNS setup help at no extra fee and publishes diagnostics/activation flows. Support is ticket-based from people who operate the mail stack—not outsourced chat—with plan-dependent urgency outside office hours.
No ads, no product analytics cookies
Vendor policy states no advertising, no tracking of mailbox content for ads, and no website analytics cookies beyond session needs. Processing is framed for service delivery, abuse prevention, and legal obligations. Payment data still goes to Stripe and PayPal under separate processor terms.

Proton Mail

Zero-access inbox encryption by default
Bodies and attachments are encrypted so Proton states it lacks keys to read stored mail. Proton-to-Proton traffic is end-to-end encrypted automatically; external recipients need password-protected messages or PGP/WKD for comparable content protection. Subject lines are not fully E2EE under OpenPGP header rules.
Proton Mail Bridge for desktop IMAP clients
Paid plans that include Mail can run Bridge locally to connect Outlook, Thunderbird, or Apple Mail over IMAP/SMTP while encrypting and decrypting on the device. Free accounts use official web/mobile/desktop apps instead of Bridge.
Custom domains, aliases, and business admin
Paid and business tiers support custom domains, extra addresses, catch-all and groups, hide-my-email aliases, and org admin for seats, storage, and retention policies. Suits teams leaving Google/Microsoft who still need branded addresses.
Open-source clients with published audits
Web, mobile, and desktop clients are published on GitHub with third-party audit reports linked from Proton’s open-source page. The hosted mail backend is not offered as self-hosted FOSS—audit client trust, not full server reproducibility.
Tracker blocking, PhishGuard, and Sentinel
Built-in tracker protection, phishing heuristics, link confirmation, SPF/DKIM/DMARC for custom domains, hardware-key 2FA, and optional Proton Sentinel monitoring for high-risk accounts. Complements encryption with everyday abuse defenses.

Assurance & compliance: Migadu vs Proton Mail
Assurance & compliance	Migadu	Proton Mail
Independent security / no-logs audit	Not found Vendor claims no ad scanning/sharing of mail content; no public third-party audit PDF located.	Vendor claimed Open-source clients with published third-party audit reports (web/desktop links on open-source page). Not a classic VPN no-logs court test; transparency report covers legal orders for accessible account data.
ISO 27001	Not found Data centers described as internationally certified; no Migadu-organization ISO 27001 certificate found on primary pages.	Vendor claimed Vendor announces ISO 27001 certification after external audit completed 2 May 2024; Trust Center links a certificate download. Confirm scope and validity at procurement time.
SOC 2 / SOC 3	Not found	Vendor claimed Vendor announces first SOC 2 Type II attestation (July 2025 blog). Report typically under NDA—request from vendor for diligence files.
GDPR / EU data protection	Vendor claimed Privacy policy asserts GDPR and Swiss DPA compliance; mail hosted in France per vendor.	Vendor claimed Swiss controller/processor with EU representative; public DPA; GDPR materials for business. Adequacy/transfer mechanisms documented for non-adequate destinations.
US CLOUD Act exposure (indicative)	Partial Swiss entity, no known US parent, mail in France; Stripe and PayPal process payments with US transfers. Infrastructure subprocessors not fully named. EuropeanStack assessment—not a vendor certification. Not legal advice.	Partial Swiss entity / no known US parent; inbox content on Proton-owned Swiss hardware with zero-access design. Partial exposure remains via US SaaS subprocessors (Zendesk support; Stripe/Chargebee/PayPal payments) and any account metadata Proton can access under Swiss process. Not legal advice.
Data processing agreement (B2B)	Vendor claimed Privacy page states it serves as privacy policy and DPA; confirm suitability with counsel.	Vendor claimed Public DPA at proton.me/legal/dpa forms part of terms when Proton acts as processor; Swiss law, Geneva jurisdiction; general authorization for listed subprocessors.
EU AI Act	Not applicable Email hosting product; not an AI system offering.	Not applicable Core product is encrypted email. Optional Scribe assistant is ancillary; not an AI-centric offering for this catalog entry.

Considerations & known limitations: Migadu vs Proton Mail
Considerations & known limitations	Migadu	Proton Mail
US payment subprocessors (Stripe, PayPal)	Medium Billing-related personal data can transfer to US processors under Migadu’s privacy policy. Mail content path is France/EU per vendor, but payment data is a separate CLOUD Act / transfer surface.	Not listed
Incomplete public infrastructure subprocessor list	Medium Primary pages name France hosting and certified DCs without a full vendor inventory for compute, storage, and backups. Procurement should request the current list and regions in writing.	Not listed
No E2EE product default; no classic mailbox 2FA	Medium Standards mail with TLS; vendor recommends user-side OpenPGP for strong content secrecy. IMAP 2FA is not offered; app-specific-style identities are not second-factor MFA.	Not listed
Daily quotas and human-mail policy	Medium Account-wide daily in/out caps and anti-bulk rules make Migadu unsuitable as a transactional/marketing ESP. Over-limit mail can be deferred or rejected after tolerance.	Not listed
No default SLA on standard plans	Low Vendor states standard offers lack SLAs; email is treated as asynchronous and occasionally disrupted. Enterprise SLA only via separate commercial discussion.	Not listed
No public independent security audit	Medium Privacy and no-ad-scanning claims are first-party. No independent audit report found for no-logs or security controls.	Not listed
Weaker defaults outside Proton	Not listed	Medium Mail to Gmail/Outlook/others is not E2EE unless password-protected or PGP/WKD is used. Subject lines are not fully E2EE. Train users or you only protect the Proton-stored copy.
US support and payment processors	Not listed	Medium Zendesk, Chargebee, Stripe, and PayPal appear in the public processor list. They should not see zero-access message bodies, but support content and billing data can touch US-group services—document this in DPIAs.
Bridge requires paid Mail	Not listed	Low Desktop IMAP/SMTP via Bridge is not available on free accounts. Budget seats for users who refuse the official apps.
Hosted service, not self-hosted FOSS mail	Not listed	Medium Open-source clients improve inspectability but you still depend on Proton’s operated backend, uptime, and Swiss legal process. Unsuitable if policy mandates customer-operated mail servers.
Swiss legal orders on accessible data	Not listed	Low Transparency reports show thousands of yearly legal orders for Mail with many complied. Bodies stay encrypted; recovery emails, IPs (when retained for abuse), and similar metadata may still be in scope. Align expectations with counsel.

Fit

Migadu

Best fit when

Agencies and freelancers hosting many client domains under one account with multi-admin or API provisioning
Organizations that want custom-domain mail with standard clients and portable IMAP—not a proprietary suite lock-in
Teams tired of per-seat pricing for large address spaces with modest real traffic
Buyers who value a small bootstrapped Swiss operator that publishes blunt product limits
Setups that need aliases, rewrites, identities, SIEVE, and postmaster-style controls more than collab apps

Poor fit when

Primary need is end-to-end encrypted mail by default (Proton Mail, Tuta, or user-side OpenPGP workflows)
High-volume transactional, marketing, or bulk outbound mail
Requirement for default contractual SLA, phone support, or multi-language admin UI
Mandatory mailbox 2FA on every IMAP login
Want a free long-term plan or Migadu-branded @provider addresses without owning a domain

Consider instead when

When: You need provider-managed end-to-end encryption as the default product promise
Consider: Proton Mail or Tuta
Migadu is standards hosting with TLS; content secrecy against the operator is not the design center.
When: You want another European professional host with a different admin/encryption/residency package
Consider: mailbox.org, Mailfence, Posteo, or Runbox
Compare DPA detail, audit packaging, and whether multi-domain usage pricing still wins for your address sprawl.
When: You need full workspace suite (docs, meet, identity) rather than email hosting alone
Consider: Google Workspace, Microsoft 365, or Infomaniak-style European suites
Migadu deliberately stays postmaster-focused.
When: You need bulk or high-rate application email
Consider: A dedicated ESP (not Migadu); Amazon SES is the common Big Tech baseline—pair with EU ESPs if residency matters
Migadu rate-limits and bans intentional bulk use.

Proton Mail

Best fit when

Teams that need default end-to-end / zero-access encryption without running their own mail stack
Orgs that want Swiss legal venue and documented resistance to direct foreign data demands
Businesses migrating branded domains off Gmail/Outlook with Easy Switch and Bridge for desktop holdouts
Security-conscious professionals who value open-source clients, published audits, and hardware-key 2FA
Buyers who need a public DPA plus vendor-claimed ISO 27001 / SOC 2 Type II for questionnaires

Poor fit when

Fully self-hosted requirements (Proton Mail is SaaS; clients are open source, not a full on-prem mail server)
Desktop IMAP on free accounts only—Bridge needs a paid plan that includes Mail
Workflows that depend on unencrypted-looking mail to external parties who will not use password links or PGP
Teams that primarily need full Microsoft 365 / Google Workspace collaboration depth rather than encrypted mail first

Consider instead when

When: You want German E2EE email with a different crypto product surface and may not need Proton’s full ecosystem
Consider: Tuta
Compare desktop interoperability and business admin maturity side by side.
When: You want ad-free European mail with strong transport privacy but do not require zero-access E2EE for all stored content
Consider: Posteo
Different threat model: Posteo is privacy-forward without Proton’s zero-access default.
When: You need OpenPGP-centric mail with classic collaboration extras under Belgian operation
Consider: Mailfence
Weigh automatic Proton-to-Proton E2EE UX versus Mailfence’s model.
When: Collaboration suite depth and ecosystem lock-in outweigh encryption defaults
Consider: Google Workspace or Microsoft 365
Accept US-provider jurisdiction and scanning/processing models as tradeoffs.

Open questions for due diligence

Migadu

What are the current named mail hosting, backup, and ancillary subprocessors and their countries?
Can Migadu provide ISO/SOC evidence for the organization or only DC-level certifications?
Is an independent security or penetration-test summary available under NDA?
Does the privacy-page DPA meet your controller’s mandatory clauses without a separate signed agreement?
What encryption-at-rest and key-management practices apply today versus the older public pro/con narrative?

Proton Mail

What exact data-center sites and any non-Swiss regions apply to your tenant’s mailbox replicas today?
Will Proton provide the full SOC 2 Type II report under NDA and confirm ISO 27001 certificate scope/expiry for your questionnaire?
For business orgs: which users will be private vs non-private, and how will admin recovery work with zero-access constraints?
Which external partners must receive E2EE content, and will they accept password-protected messages or PGP?