$1,200 a year for 20 mailboxes. Or $49.

Fastmail Business Standard · $5 per user per month on annual billing, USD · 20 mailboxes · checked 9 September 2026

Every address you add is another $60 a year. JustEmails is $49 a year total — unlimited mailboxes, unlimited domains, one inbox.

Fastmail pricing: $5 per user per month on annual billing, USD. Checked against their published pricing on 9 September 2026. If it has changed since, the comparison above is out of date and we'd rather you told us than took our word for it.

What $49 a year buys

Free migration from Fastmail over IMAP — folders and read state intact. DNS records written and verified for you, per domain. Keep Fastmail running while you test it.

Feature by feature

Who should pick what

Deliverability: both authenticate properly, one watches your DNS

Fastmail and JustEmails both publish SPF, DKIM and DMARC correctly on custom domains, so on the authentication checks a receiving server runs first there is nothing to choose between them. Fastmail has twenty-five years of clean sending reputation behind their infrastructure, which is a genuine asset.

Inbox placement at ordinary volume is decided by sender behaviour rather than by host: consistent volume, engaged recipients, near-zero complaints, and DNS that still resolves on the day you press send.

The common failure is administrative rather than reputational. A nameserver change, a DKIM record lost during an unrelated edit, an expired signature — mail continues to send, authentication quietly starts failing, and the first signal is a customer saying your reply never arrived.

We re-check MX, SPF, DKIM, DMARC and MTA-STS on every verified domain every six hours and alert you the first time one breaks, by email and optionally by webhook. Fastmail does not offer equivalent monitoring. With one domain you would probably notice on your own; across a dozen, you would not.

Where Fastmail is simply better

The webmail is the best in the category and it is not especially close. Search is fast and precise, keyboard shortcuts are thorough, and the whole thing feels built by people who read a great deal of email themselves. Our webmail is functional and improving; theirs is a pleasure to use, and if you spend your working day in a mail client that difference is worth real money.

Calendar and contacts are first-class at Fastmail and we do not offer them at all. That is a flat capability gap, not a matter of polish — if you want calendar and mail in one place, we are not a candidate.

They have also been running email since 1999, privately held and profitable, through every wave of competition the category has had. We shipped in 2025. Their privacy record is twenty-five years of advocacy; ours is a policy and an intention. If longevity is part of what you are buying, no feature table closes that gap, and waiting until we have proved ourselves is a legitimate decision.

Where the flat fee starts to matter

The comparison turns on a single question: do you have more addresses than people? Fastmail bills per user, so ten addresses across four domains is ten billable users regardless of how many humans are behind them. On our plan, mailboxes are not a billable unit at all.

Custom domains also sit behind Business Standard at Fastmail — the cheaper Business Basic tier cannot do custom domains at all, which is why every figure on this page compares against Standard. Quoting the cheaper tier would compare us against a product that cannot do the job.

To keep it honest in the other direction: the part of our pricing that does scale is dashboard members at $2 each per month, with the owner free. If four people each need their own login and there are only four mailboxes between them, the gap narrows considerably. It widens the moment those four people are managing twenty addresses, which is the case this product was built for.

What changes when the domain count goes up

Fastmail supports up to 100 domains on Business Standard, so this is not about whether it can be done. It is about what it costs and what it takes to run.

The cost part is arithmetic: $5 per user per month means the bill tracks mailboxes, and a portfolio owner's mailbox count tracks domains. Ten domains with two addresses each is twenty mailboxes, which is $1,200 a year on Business Standard against our flat $49. Nothing about that changes as you add the eleventh domain on our side.

The running part is DNS. Each domain needs its records published and kept correct, and nothing in Fastmail watches them afterwards. We generate MX, SPF, DKIM and DMARC per domain, verify them before marking the domain live, and re-check every six hours with email and webhook alerts on drift.

One account-wide verification value covers every domain you own, so publishing across a portfolio is a single templated pass at your DNS provider rather than a per-domain lookup. That detail exists because a customer with several thousand parked domains pointed out that a unique token per domain proves nothing the MX record does not already prove.

Common questions

Move one domain and see

7 days free. Keep Fastmail running while you try it — nothing has to move until you're convinced.

Or read the full pricing breakdown.