As of June 2026, Fastmail still lets you spin up a real, ad-free mailbox in about ten minutes with a free trial of up to 30 days, no credit card required to start. The catch nobody warns you about is the part that trips up almost everyone: your login password does not work in Apple Mail or Outlook, and a custom domain means editing DNS records. I set up a fresh Fastmail account end to end for this guide, and below is the exact order I’d do it in so you don’t backtrack halfway through.
Start the Trial and Choose a Plan
Go to fastmail.com, click Sign up, and start the free trial of up to 30 days. No card is charged until the trial ends. Pick a plan during signup: Individual is €6/month (€5/month on annual billing) with 60 GB of storage.
The signup flow starts the trial first and asks for payment only at the end, so you can import your real mail and live in the account before committing. According to fastmail.com/pricing, the trial runs up to 30 days on every plan.
The plan you pick mostly affects mailbox count and storage, not setup steps:
- Individual — €6/month, or €5/month annual (€60/year). 60 GB total (50 GB mail, 10 GB files). One person.
- Duo — €10/month, or €8/month annual. 120 GB total, 60 GB per person. Two people.
- Family — €14/month, or €11/month annual. Up to 360 GB, 60 GB per person. Up to 6 people.
You can switch tiers later without losing data, so don’t agonize. If you want the full per-tier breakdown and the multi-year discounts, I put the numbers in the Fastmail pricing breakdown.
Pick Your Address or Custom Domain
Choose a free username on fastmail.com (or another bundled domain) during signup, or connect a domain you own. A custom domain needs MX records pointing to in1-smtp.messagingengine.com (priority 10) and in2-smtp.messagingengine.com (priority 20).
If you just want a clean address, pick a @fastmail.com username and you’re done. The decision worth pausing on is the custom domain, because that’s where most of the setup time goes.
For a domain you already own, open Settings → Domains after signup and add it. Fastmail gives you two paths:
- Let Fastmail host your DNS (change nameservers). It auto-configures MX, SPF, and DKIM. Easiest, and the one I recommend if you don’t already run a website on that domain.
- MX-only (keep DNS where it is). Best when a site already lives on the domain. You manually add two MX records —
in1-smtp.messagingengine.compriority 10 andin2-smtp.messagingengine.compriority 20 as the only two MX records — then add the SPF and DKIM records Fastmail shows, per the MX-only setup guide.
DNS edits propagate over a few hours, so do this when you’re not expecting urgent mail.
Set a Password and Two-Step Verification
Create a unique password no other account uses, then open Settings, Privacy & Security and turn on two-step verification with a security key or authenticator app. That stops a leaked password alone from opening your inbox.
Email is the recovery channel for nearly every other account you own, so it deserves the strongest lock you have. After you log in, go to Settings → Privacy & Security and enable two-step verification. Fastmail supports security keys (a hardware key or passkey) and authenticator apps that generate time-based codes; you can register both, which I’d do so a lost phone doesn’t lock you out.
If you’re coming from Gmail and want the same idea on that side before you migrate, the steps map cleanly onto our Gmail two-factor walkthrough.
Start your Fastmail account — free trial up to 30 daysOne thing to internalize now: two-step verification protects the web and app login, not your mail clients. Apps like Apple Mail use a separate app password, covered below — they are two different credentials, and confusing them is the number-one setup snag.
Import Old Mail, Contacts, and Calendars
Use the Migrate from another provider wizard in Settings. Enter your old email address and its password (or an app password for Gmail/Outlook), and Fastmail copies mail, contacts, and calendars in the background without touching the original account.
This is the part that surprised me — it just worked. When I set up my Fastmail account, the import wizard pulled years of Gmail into folders in the background while I kept configuring everything else; nothing in the old account changed.
Open Settings → Migrate (Migrate from another provider). You’ll enter:
- Your old email address.
- Its password — or, for Gmail and Outlook, an app password generated on that provider’s side, because they also block plain passwords over IMAP.
The copy can take minutes to hours depending on mailbox size, and you can keep using Fastmail while it runs. Calendars and contacts come across the same way. If you’re consolidating several accounts at once, our guide on managing multiple email accounts covers how to keep them organized after the dust settles.
App Passwords, IMAP, and SMTP
Fastmail rejects your normal password over IMAP and SMTP because third-party clients can’t do two-step verification. Generate an app password in Settings, Privacy & Security, Connected apps and API tokens, then use imap.fastmail.com port 993 and smtp.fastmail.com port 465.
This is the wall people hit. Per Fastmail’s help docs, if you type your normal or two-step verification password into Apple Mail, Outlook, or Thunderbird, syncing fails with a password error. The fix is an app password.
To create one: Settings → Privacy & Security → Connected apps & API tokens → Manage app passwords → New app password. Name it (e.g. “iPhone Mail”), pick what it can access, and click Generate password. You paste it once into the client; you don’t need to memorize it, and you can revoke a single device later without touching anything else.
Then enter the server settings, from the server names and ports reference:
| Protocol | Server | Port | Encryption |
|---|---|---|---|
| IMAP (incoming) | imap.fastmail.com | 993 | SSL/TLS |
| SMTP (outgoing) | smtp.fastmail.com | 465 | SSL/TLS |
| SMTP (alternative) | smtp.fastmail.com | 587 | STARTTLS |
| POP (if needed) | pop.fastmail.com | 995 | SSL/TLS |
Username is your full Fastmail address; password is the app password, never your login. If you’re choosing where to read this mail on a PC, our roundup of the best email clients for Windows all connect with these same settings.
Aliases and Signature
Add aliases under Settings, Aliases to receive mail at several addresses in one inbox, and set a signature under Settings, Identities so outgoing replies are branded. Aliases share the same mailbox, so there’s nothing extra to log into.
Aliases let one inbox catch mail sent to you@fastmail.com, sales@yourdomain.com, and a throwaway address you hand to a newsletter — all in the same place. Add them under Settings → Aliases, and pair each with an Identity (Settings → Identities) so replies go out from the right address with the right signature.
The signature lives on the identity, not the account, which means you can have a clean personal sign-off and a formal work one and let Fastmail pick based on which address received the message.
Common Setup Mistakes
The two failures that waste the most time are typing your login password into a mail app instead of an app password, and pointing a custom domain’s MX records wrong. Both produce silent errors, not obvious warnings.
From doing this myself and reading the support threads, here’s what trips people up:
- Using your main password in Apple Mail/Outlook. It will fail every time. Generate an app password instead — this is by design, not a bug.
- Custom-domain MX records left half-done. If you only add MX and skip SPF/DKIM on the MX-only path, mail receives but your outgoing mail can land in spam. Add every record Fastmail lists.
- Expecting DNS changes to be instant. Propagation takes hours. Don’t switch your domain’s mail during a busy day.
- Letting the trial lapse with no payment set. The trial is up to 30 days; add billing before it ends or access pauses.
- Confusing two-step verification with app passwords. Two-step protects the web login; app passwords protect mail clients. You need both.
Verdict
Best for: anyone who wants a fast, ad-free mailbox with strong privacy, custom-domain support, and aliases, and who is comfortable creating an app password for their mail apps. Skip Fastmail if you need a free permanent account or won’t pay after the trial.
Fastmail’s setup is genuinely quick — the trial, import wizard, and aliases are all smooth. The only friction is structural: app passwords for clients and DNS for custom domains. Neither is hard once you know they’re coming, which is the whole point of reading this first.
Best for: privacy-minded users, custom-domain owners, anyone leaving a free webmail provider. Skip Fastmail if: you want a free permanent inbox, or you only use webmail and balk at paying after the trial.
If your next step is wrangling several inboxes into one view, see our unified inbox setup.
Alexis Dollé, email expert for 10+ years. Founder of Email Tools. I test every email client and utility myself, then write about them the way I’d explain them to a friend — no marketing fluff, no sponsored rankings, every claim sourced.
LinkedInSources & references
- Fastmail pricing page, fastmail.com. Plans, storage, and up-to-30-day trial. Accessed 2026-06-03. fastmail.com/pricing
- App passwords, Fastmail help. Why the main password fails over IMAP/SMTP and how to generate an app password. Accessed 2026-06-03. fastmail.help — App passwords
- Server names and ports, Fastmail help. IMAP/SMTP/POP servers and ports. Accessed 2026-06-03. fastmail.help — Server names and ports
- Setting up your domain: MX only, Fastmail help. Custom-domain MX record values. Accessed 2026-06-03. fastmail.help — MX only
- Set up Fastmail on your device, Fastmail help. Device and import guidance. Accessed 2026-06-03. fastmail.help — Set up on your device
Frequently Asked Questions
Is there a free trial for Fastmail and do I need a credit card?
Yes. Fastmail offers a free trial of up to 30 days on every plan, and you can start it without entering a credit card. You only add payment if you decide to keep the account after the trial, so you can import your real mail and test the apps with no charge. Trial length confirmed on fastmail.com/pricing as of June 2026.
How do I set up a Fastmail account with my own custom domain?
After signing up, go to Settings then Domains and add your domain. The simplest route is to let Fastmail host your DNS by changing nameservers, which auto-configures MX, SPF, and DKIM. If you keep DNS elsewhere, set two MX records pointing to in1-smtp.messagingengine.com (priority 10) and in2-smtp.messagingengine.com (priority 20), and add the SPF and DKIM records Fastmail shows you. DNS changes can take a few hours to propagate.
Why won’t my Fastmail password work in Apple Mail or Outlook?
Fastmail does not accept your normal login or two-step verification password over IMAP, POP, or SMTP, because third-party clients cannot complete two-step verification. You must generate an app password in Settings, Privacy & Security, Connected apps & API tokens, then paste that into your mail client. Each device or app gets its own app password you can revoke independently.
What are the Fastmail IMAP and SMTP server settings?
For incoming mail use imap.fastmail.com on port 993 with SSL/TLS. For outgoing mail use smtp.fastmail.com on port 465 with SSL/TLS, or port 587 with STARTTLS if your client only supports STARTTLS. POP is pop.fastmail.com on port 995. Sign in with your full Fastmail email address and an app password, never your main password.
Can I import my old emails and contacts into Fastmail?
Yes. Fastmail’s Migrate from another provider wizard in Settings copies mail, contacts, and calendars from providers like Gmail and Outlook over IMAP. You enter your old address and either its password or, for Gmail and Outlook, an app password from that provider. The copy runs in the background and leaves the original account untouched.
How do I turn on two-step verification on Fastmail?
Open Settings, then Privacy & Security, and find the two-step verification section. You can add a security key, an authenticator app that generates time-based codes, or both. Once enabled, web logins ask for a second factor, while connected mail apps continue to use the app passwords you generated separately.
Related: best unsubscribe tools for cleaning up the inbox you just migrated.