A Fastmail alternative with shared mailboxes and notes

Fastmail is fast, standards-based mail with excellent IMAP, CalDAV and JMAP support. Work Inbox trades that client support (no IMAP yet) for shared mailboxes, live notes and the option to self-host on Cloudflare.

Start free 14 days, no card. Or self-host for free.

Side by side

Fastmail's facts from its own pages, checked 9 November 2026. Prices as Fastmail shows them, before tax.

Feature	Work Inbox	Fastmail
Price per person	€1 / €2.50 / €5 a month (Starter, Pro, Business), billed monthly; first 5 people free, at least 5 billed; self-hosted free	Three plans, priced in your local currency
Free plan or trial	Included: Free for up to 5 people; 14-day trial for teams, no card. Self-hosting free for good	Partly: Up to 30-day trial, no free plan
Shared mailboxes	Included: Unlimited on every plan, no licence per mailbox	Partly: Shared addresses and aliases, not separate shared mailboxes
Aliases and catch-all	Included: Unlimited aliases, catch-all per domain, plus addressing	Included: 600 aliases plus 15 per person; catch-all and plus addressing
Notes or docs edited together	Included: Shared notes with live editing, checklists, tables, @mentions	Not available: No notes or document editor
Self-hosting and source code	Included: Open source; runs on your own Cloudflare account	Not available: No (its Cyrus IMAP server is open source)
IMAP and mobile mail apps	Not available: Not yet: web app only (installable). IMAP gateway planned	Included: IMAP, SMTP, CalDAV, CardDAV, JMAP and mobile apps
Claude / ChatGPT (MCP)	Included: MCP server: search and read mail, notes, contacts and drive files on every plan; replies and changes on Pro and Business	Partly: Public JMAP API; no official MCP server
Calendar, contacts, files	Partly: Calendar, contacts (a team address book) and a shared drive; no office documents or video calls	Included: Calendar and contacts; file storage

Fastmail's plans

Basic, Standard and Professional: 6 GB, 60 GB and 150 GB a person (prices shown in the visitor's currency)
Custom domains on Standard and Professional, not on Basic

Why teams pick Work Inbox

Shared mailboxes a whole team answers.
Live shared notes next to the mail.
Open source and self-hostable.

Pick Fastmail if

You want to keep your IMAP and CalDAV apps on every device.
Mail alone is what you need, from an independent vendor.
You need CalDAV calendars in your phone's calendar app.

Sources

Other comparisons

vs Cloudflare Agentic Inbox

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