bytemail
Try free for 7 days
Fastmail on Mac

Fastmail on your Mac, over JMAP.

bytemail speaks JMAP, the modern mail protocol Fastmail helped create, so your Fastmail account syncs quickly and stays in step with Fastmail's own apps. Custom domains and aliases come along.

Try it with Fastmail How to connect
What works

Fastmail in bytemail

JMAP, not just IMAPFastmail's modern protocol for quicker syncs and fewer round trips.
Custom domainsYour own domain on Fastmail works like any address.
AliasesReply from the address the mail went to.
Direct connectionMail goes from Fastmail to your Mac, never through our servers.
Next to your other mailKeep Fastmail in the same inbox as Gmail or iCloud.
Token you controlRevoke the API token in Fastmail any time.
Setup

Add Fastmail in a minute

  1. 1In Fastmail, create an API token with mail access.
  2. 2Open bytemail, choose Fastmail, and paste your address and the token.
  3. 3Your Fastmail mail appears next to your other accounts.
How you sign in

Create an API token in Fastmail under Settings › Privacy & Security › Integrations, then paste it into bytemail.

On top of Fastmail

What bytemail adds

Notch and widgets New mail grows out of the notch. Reply, open links or mark it read from there. AI assistant Summaries, drafts, Rewrite and translation, with Apple Intelligence, ChatGPT, Claude or a local model. Read receipts See when what you sent was opened, without the false alarms from Apple's privacy proxy. Search An index on your Mac searches every account as you type; older mail is found on the server. Keyboard shortcuts Gmail, Outlook, Apple Mail or Superhuman keys, or your own.
Questions

Fastmail and bytemail

What is JMAP?

A newer standard for mail, designed to replace IMAP, that syncs with less waiting. Fastmail supports it fully.

Can I use IMAP instead?

Yes. Add Fastmail as an IMAP account with an app password if you prefer.

Does it cost extra?

No. Every provider is included in every plan.

Other accounts

Try bytemail with your Fastmail account.

Free for 7 days, then $3.99 a month. Your current app keeps working alongside it.

Choose a plan

Everything included

  • AI assistant with ChatGPT, Claude and more
  • MCP for Claude, Codex and other AI apps
  • bytemail for iPhone at no extra cost, coming soon
  • Up to 5 devices, Mac and iPhone

Then $39.90/year.Then $3.99/month. Cancel before day 7 and you pay nothing.

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