Proton for Business Alternatives

A two-partner law firm in Zurich asked me to review their email set-up last year. They were on Proton for Business and loved it — genuinely loved it. Client files were confidential by default, the Swiss jurisdiction was part of their pitch to clients, and neither partner wanted their mail sitting on American advertising infrastructure. What they did not love was the day a client's opposing counsel — on Outlook, on a plain Exchange tenancy — refused to click the password-protected link that Proton sends to outside recipients, and a deadline got hairy. "The encryption is why we bought it," one partner told me. "The encryption is also why half our mail ends up in someone's spam folder." That sentence is the whole trade-off of encrypted business email, and it is where most Proton alternatives conversations begin.

Proton for Business is a genuinely unusual product. End-to-end and zero-access encryption means the company itself cannot read your mail — not at rest, not under subpoena, not in transit between Proton accounts. The data lives in Switzerland under Swiss privacy law. You get custom domains, and the subscription bundles Proton Drive, Calendar and a VPN. On the figures we track at time of writing, the business plans run around $7 per user per month and — this matters — renew at the same rate. No teaser price, no doubling in year two. In a market where every other host doubles at renewal, Proton's flat pricing is one of the cleanest deals going.

So why would anyone leave? Not price shock. Fit.

How Proton's encryption changes daily work

It is worth being precise about what the encryption actually does, because marketing blurbs blur it. Between two Proton users, messages are end-to-end encrypted — genuinely, cryptographically private. To anyone outside the Proton ecosystem, your message leaves as a password-protected portal link (or plain text if you turn that off), because there is no way to end-to-end encrypt to a mailbox whose provider does not support it. For a firm whose correspondents are all on Proton, that is a non-issue. For a normal business whose customers are on Gmail, Outlook and everything else, every message is a small friction: a link, a password, an extra click, and occasionally a recipient who cannot or will not deal with it.

The other operational realities I have hit in testing: no phone support at all (support is ticket and live chat, and for a business paying per seat that surprises people); calendar and contact syncing works through standards like CalDAV and CardDAV rather than the native Outlook experience some offices expect; and there is no simple path to the kind of mail journaling, retention and eDiscovery tooling that regulated industries in some jurisdictions are required to run — the privacy model that makes Proton attractive actively works against mail archiving that lets an administrator read everything.

When it makes sense to leave Proton for Business

The external-recipient friction is costing you real work

If important mail regularly ends up unopened because the recipient will not deal with a portal link, or your team has quietly disabled the encryption for external mail anyway, then you are paying for encryption you are not using — and tolerating the one feature that differentiates the product.

You need administrative visibility

If compliance requires you to archive, journal or audit employee mail, Proton's zero-access model is a feature that fights you. This is not a flaw in the product; it is a design decision. But for a financial adviser in a jurisdiction that requires eDiscovery, it is disqualifying.

The per-seat cost adds up

Flat pricing is honest, but it is still per-user pricing. A ten-person company pays real money every month, and the cheaper providers in this list cost a fraction per seat. If your mail needs are ordinary — custom domain, spam filtering, mobile sync — you may not need what Proton sells.

The ten-seat arithmetic

Let me put rough numbers on it, using the figures we track at time of writing. A ten-person team on Proton at around $7 per user per month pays roughly $840 a year, and — credit where it is due — the same $840 in year two. The same team on Zoho's entry paid tier pays around $120 a year. On Fastmail, roughly $360 a year, flat. On Google Workspace, around $720 a year for the full productivity suite. None of those alternatives give you zero-access encryption; every one of them gives you plain, interoperable email that reaches outside recipients without a portal. The question is not "which is cheapest" — it is "is the confidentiality worth $500–700 a year over the cheap options and the friction with outsiders". For a law firm, obviously yes. For a ten-person marketing agency whose clients email them memes, obviously no. Most businesses land somewhere in between, and the honest answer is to write down what you would actually lose.

Missing features or support friction

No phone support. If you have had a mail emergency and wanted a human voice, that absence stings. If you rely on deep Microsoft 365 or Google Workspace document workflows, Proton's bundled office tooling is thinner than those ecosystems.

When you should stay

Stay, emphatically, if the confidentiality is the point. Lawyers, doctors, journalists, therapists, investigators, anyone handling client-privileged or health-adjacent correspondence: Proton's model is the real thing, the Swiss jurisdiction is genuinely meaningful, and the flat renewal pricing means the deal does not quietly degrade over time. Stay if your correspondents are mostly internal or also privacy-conscious — within the Proton ecosystem the friction disappears entirely. Stay if you value the bundled Drive and VPN and the fact that one subscription covers a whole privacy posture rather than five tools. And stay if you have already trained your clients on the portal workflow; that training is a sunk cost that switching does not refund.

My honest read: Proton is overkill for a landscaping company and under-negotiable for a compliance-bound brokerage. It is exactly right for the businesses in between whose clients chose them partly for discretion.

The alternatives

These are the names I would weigh, and the honest case for each.

Zoho Mail — the value play. Zoho has a free tier for small teams on custom domains (limited users and storage, but genuinely free), with paid plans starting around $1 per user per month on the figures we track at time of writing. You get an ad-free business email experience, custom domains, and a large app ecosystem if you later want CRM and docs in the same account. You lose the zero-access encryption entirely — Zoho can read your mail — so this is a trade of privacy for price and convenience. For most small businesses that do not handle privileged correspondence, it is the sensible one.

Fastmail — the privacy-minded independent that is not encrypted at rest in the Proton sense but has a long, clean reputation for not mining your mail, excellent spam filtering, and genuinely nice calendar and contact handling. Around $3 per user per month and flat at renewal on the figures we track — no price cliff. Fastmail works beautifully with standard mail clients, which solves the external-friction problem completely. If what you actually want is "good email that stays out of my way", this is my usual recommendation.

Migadu — the unconventional one. Migadu prices by mailbox capacity rather than per seat — around $4 a month at the entry tier on our figures, flat at renewal — and lets you run unlimited users and domains within that capacity. For a small team with many addresses (info@, support@, per-project aliases), the economics are excellent. The product is deliberately simple and the company is small and Swiss-based, which keeps some of the jurisdictional comfort of Proton. The trade-off: less polish, no bundled office suite, and you are trusting a small provider.

Google Workspace — the default half the business world runs on. Gmail for your domain, shared drives, Meet, and the document tools your clients probably already use. Around $6 per user per month on the figures we track at time of writing — flat in our data, though Google has adjusted list prices over the years, so check the current rate. You are buying convenience and compatibility, and paying for it with privacy: Google's business terms are better than its consumer terms, but this is still advertising-adjacent infrastructure. If interoperability beats confidentiality for you, this is the pragmatic choice.

Tuta (Tutanota) Business — the direct Proton competitor. End-to-end encrypted email from a German company with EU data residency, priced noticeably below Proton at the entry end. The apps are clean, the calendar is encrypted too, and the whole thing is built on the same philosophy. The trade-offs: a smaller ecosystem, fewer third-party integrations, and the same external-recipient friction you have now — moving to Tuta does not solve the opposing-counsel problem, it just changes your invoice.

Purelymail — the shoestring option. A small, inexpensive email host that keeps costs at pocket-money levels and does the basics well. I have less direct long-term experience with Purelymail than the names above, so I will not quote renewal figures — check their plans directly. For hobby projects, side businesses and personal domains, it fills a real niche.

A note on the privacy claims you will read

Every provider in this list makes some kind of privacy claim, and they are not equivalent. Proton's zero-access architecture is a technical guarantee enforced by cryptography. "We do not sell your data" is a policy promise, changeable by the next terms-of-service update or the next acquisition. Fastmail and Migadu sit in between: independent companies with long-standing policies and no advertising business model. Google and Zoho are advertising-adjacent or data-hungry in ways their business terms constrain but do not eliminate. None of this makes one provider evil and another pure — it makes them different products at different prices. Match the guarantee to what your clients actually expect from you, and be honest in your own privacy policy about which one you bought.

How to switch without downtime

Email migrations are the worst migrations, because mail is stateful and people notice within minutes. Do it in this order.

1. Export and inventory first. List every mailbox, alias, forwarder, catch-all and distribution list currently on Proton. Proton's own import/export tooling and Easy Switch service can pull mail in from other providers; going out, plan on IMAP export for each mailbox.
2. Set up the new provider with all accounts created and DNS unmodified. Mail still flows to Proton while you configure the new side. Create every mailbox, alias and forwarder before touching DNS.
3. Run an initial IMAP sync of every mailbox (tools like imapsync do this well). At this point the new mailboxes are snapshots behind live ones.
4. Lower DNS TTLs on MX, SPF, DKIM and related records a couple of days ahead. Publish the new SPF and DKIM records early — with both providers' records overlapping during transition — so mail is not rejected mid-cutover.
5. Cut MX records at a quiet hour, run a final IMAP sync to catch the last messages, and watch both sides for a few hours. Test sending to Gmail, Outlook and a corporate Exchange address — deliverability is where migrations fail quietly.
6. Keep the Proton account active for at least two weeks for anything the sync missed, and be aware of the 30-day money-back window on the new provider in case you change your mind. Calendar and contacts migrate separately (CalDAV/CardDAV export or ICS/CSV), so do not consider the migration finished until phones and calendars are right.

How we evaluate hosting providers

HostingSpotter tracks renewal pricing above everything, because the second invoice is the price you actually pay. For every provider we record the intro rate, the renewal rate and the step between them, then check what is included at the renewal rate — storage, aliases, support channels, admin tools, migration help. For email specifically we also weigh the things pricing pages do not advertise: whether external recipients can read your mail without jumping through hoops, whether admins can meet their compliance obligations, and whether the provider has a business model that will still be here in five years. We verify against the provider's own pages and terms, we mark uncertain figures "at time of writing", and we would rather say we do not know than invent a number. The pricing above was accurate to the figures we had when this was written — check the live plans before you move a production mail system.