Fastmail vs HEY for Personal Email: Standards or Strong Opinions?

Fastmail vs HEY for personal email is not really a features argument. It is a question about where your email workflow lives — in a protocol you can point any app at, or inside one company's product that has strong opinions about how mail should work.

Both are paid, ad-free, independent providers. Both are genuinely good at what they set out to do. But they disagree at the foundation, and that disagreement decides almost everything else — including how much it costs you to change your mind later.

The verdict up front#

For most people, Fastmail is the better personal email provider. It gives you a normal mailbox that speaks the normal protocols, so you can use it from Apple Mail, Thunderbird, Outlook, a Gmail-style web client, or Fastmail's own apps — and swap between them without asking permission.

That matters more than it sounds. A provider you can reach over IMAP is a provider whose data, clients and habits survive you leaving. Fastmail says as much on its own homepage: "People stay because we're the best, not because it's too hard to get your data out."

HEY wins on one dimension outright, and it is not a small one: first-contact control. HEY's Screener puts every sender you have never heard from into a holding area and makes you decide, once, whether they are allowed to reach you at all. Fastmail has nothing equivalent. Its rules and blocking are reactive — you deal with the sender after they have already landed in your inbox.

So the honest split is this. If you want a mailbox, choose Fastmail. If you want a *system*, and you have read HEY's design decisions and actively agree with them, HEY is a coherent product that will do exactly what it promises. Just go in knowing that HEY's workflow is not portable, because the thing that makes it good has no representation in any email standard.

Fastmail vs HEY at a glance#

Every row below is drawn from each vendor's own live documentation as of September 2026. Capabilities change; verify anything decision-critical on the vendor's page before you buy.

Where Fastmail wins#

Fastmail's advantage is structural rather than feature-by-feature. It does not try to be the last email app you ever use; it tries to be a mailbox that any email app can use.

You keep your choice of client, permanently#

Fastmail documents IMAP, POP and SMTP access for third-party clients, using an app password rather than your account password, over SSL/TLS. That single fact is why Apple Mail, Thunderbird, Outlook and Mac-native clients like Mimestream all work against a Fastmail account.

It also means the client is a replaceable part. If a better app ships next year, you point it at the same mailbox and nothing about your mail moves. Your provider and your interface are two separate decisions, and you get to make them independently.

One caveat worth knowing before you sign up: Fastmail's entry-level business tier, Basic, does not include IMAP, SMTP, CalDAV or CardDAV. The individual, Duo and Family plans do list third-party app compatibility. If protocol access is the reason you are choosing Fastmail, confirm your specific plan includes it.

Standards work the same way for calendar and contacts#

CalDAV and CardDAV mean your calendar and address book are reachable by the same open clients as your mail, not just by Fastmail's apps. Fastmail's calendar also lets you add Google and iCloud calendars alongside your own.

Fastmail has gone further than consuming standards. Its homepage describes contributing "the development of JMAP, the next-generation open sync protocol, and a wide range of open-source code used by organizations around the world." A provider that invests in the protocol is a provider with a structural reason not to trap you.

Leaving is a non-event#

This is the quiet one. With IMAP, leaving is not an export feature you have to hope exists — it is the normal operation of the protocol. Any client can pull a complete local copy of every folder, and a migration to another IMAP host is a server-to-server copy.

Fastmail also takes an explicit position on data monetisation: "no mining of your personal data, no sharing it with third parties, and no ads, ever," alongside masked email addresses and spy-pixel blocking. Masked email in particular is the practical privacy feature here — a unique throwaway address per site, which you can kill without changing your real address.

Where HEY wins#

It would be easy to write HEY off as the closed option and move on. That would be wrong, and it would miss the reason people who like HEY like it so much.

The Screener is the best first-contact control in mainstream email#

HEY's pitch is "screen emails like you screen calls." The first time an address emails you, it lands in The Screener and goes no further until you say yes. Say no once and you never see that sender again.

Fastmail has no answer to this, and neither does Gmail, Outlook or iCloud. Every one of them is reactive: mail arrives, you notice it, you make a rule or block the sender, and you repeat that for the next address. HEY made the decision point *before* arrival, and it is genuinely the better design for a personal address that gets scraped and resold.

If your inbox problem is that strangers reach you constantly, this one feature can be worth the whole trade. Nothing else in this comparison outweighs it as cleanly.

The triage structure is opinionated and coherent#

HEY splits mail by kind, not by folder. The Imbox is for "important, immediate emails." Newsletters go to The Feed, "a separate, dedicated space where they can shine." Receipts and confirmations go to Paper Trail, out of the way.

On top of that sit Reply Later, a pile for things you owe a response to, Set Aside for things you need to reference, and Focus & Reply, which shows only your Reply Later pile so you answer them one after another. Clips saves snippets of text, and Files collects every attachment you have ever received.

You can rebuild rough versions of most of this on Fastmail with folders and rules. You cannot rebuild the part where it is already built, already consistent across every device, and maintained by someone else.

HEY shipped an agent-accessible interface#

This is newer and often missed. HEY publishes an official CLI and a terminal UI, and its agents page states that connected agents "can do anything in HEY you can do" — review the Screener, mark things as spam, draft replies, label things — naming Claude, Codex and others as agents you can point at it.

That is a real capability and Fastmail does not advertise an equivalent. It is worth noting what the page does and does not document: as of September 2026 it describes what agents can do, and does not describe an approval step before sending, an undo window, or an audit trail of agent actions. If you plan to let an agent act in your mailbox, that is the part to check for yourself.

What HEY's closed design actually costs#

HEY's FAQ is refreshingly direct about the limit: "HEY doesn't support IMAP or POP," and "off-the-shelf 3rd party email apps won't work with HEY." HEY's own apps — web, Mac, Windows, Linux, iOS and Android — are the only way in.

Credit where it is due on data, though. HEY lets you "export an MBOX file with all your email and attachments any time," with contacts as vCard, and that MBOX imports into Apple Mail, Gmail or Outlook. That is a real export, not a token one, and it is better than several larger providers offer.

The asymmetry is at the other end. HEY does not import your existing mail from Gmail, Outlook or iCloud — you can forward new mail in, but your archive stays where it is. So the door out is wide and the door in is narrow.

Pricing model, and why you should check it yourself#

We do not publish competitor prices, because they change and a stale number in a blog post is worse than no number. What is stable enough to compare is the shape of each offer.

Fastmail sells individual, Duo and Family plans for personal use, plus Basic, Standard and Professional business tiers, all billed per user and separated mainly by storage and included features. Its pricing page advertises a free trial of up to 30 days. The one shape detail that affects this comparison: the Basic business tier excludes third-party app access.

HEY is sold as HEY for You for a hey.com address, HEY for Domains if you want your own domain, and HEY for Work for organisations. HEY's own FAQ frames commitment in terms of your first year — if you have paid for year one your @hey.com address stays yours permanently, and forwarding mail out to another address becomes available. Without that first-year payment, the FAQ says the address recycles after 90 days.

That first-year framing is the part to read carefully, because it ties both your address and your exit route to having paid through the initial term. Check the current terms on hey.com before committing.

Who each one is genuinely for#

Feature tables do not decide this. Two questions do: do you already have an email workflow you like, and how likely are you to change providers again?

• Choose Fastmail if you use a specific email client and want to keep it, or expect to try new ones. IMAP makes that free.
• Choose Fastmail if you want your domain, calendar and contacts to be reachable by open clients rather than by one vendor's apps.
• Choose Fastmail if you are consolidating a long mail history — a standards-based provider accepts an archive that HEY does not import.
• Choose HEY if unsolicited first contact is your actual problem and the Screener reads like a relief rather than a chore.
• Choose HEY if you would rather adopt someone else's well-argued system than design and maintain your own rules.
• Choose HEY if living entirely in one vendor's apps on every device is a feature to you, not a constraint.

A third option, honestly#

We build AI Emaily, and this is our site, so the fair thing is to say plainly why we are not the top row of the table above. Fastmail and HEY host your mailbox. AI Emaily does not — it is an AI email client that connects to a mailbox you already have. Ranking ourselves first in a hosting comparison would be a category error, and the reader would catch it.

Where we fit is the layer this post keeps circling: the workflow. AI Emaily connects to Gmail, Outlook and standard IMAP accounts — Fastmail included — and does the triage, drafting and follow-up chasing that you would otherwise build by hand in rules. Drafts are written from a Personal Context brain you set yourself plus per-client profiles, not by reading your history and guessing. In Copilot mode nothing sends without your approval, and every agent action has an undo and an audit entry.

The limit is the one the whole post is about, and it cuts against us. Because HEY has no IMAP, AI Emaily cannot connect to a HEY account at all — the same closed design that makes Apple Mail impossible makes us impossible. A Fastmail account on a plan that includes IMAP connects fine. If you want an opinionated workflow but not a closed mailbox, pairing a standards-based provider with a client that supplies the intelligence is the combination that stays reversible.

There is no permanent free tier here either. It is a 7-day free trial on Pro or Autopilot, card required, and nothing is charged if you cancel before day seven. What each plan includes is on our pricing page.