Fastmail vs Zimbra (2026): which should you pick?

Fastmail

• People leaving free, ad-funded email for a paid private service
• Using your own domain for personal or family addresses
• Small businesses that want email without a full office suite

Zimbra

• Companies and schools that need to keep email on servers they control
• Hosting providers offering white-labeled email to customers
• Teams moving off Microsoft Exchange who want Outlook compatibility

Fastmail

• There is no free plan. After the 30-day trial every account is paid, and Fastmail does not refund unused subscription time.
• The Basic business plan has 6 GB per user and leaves out custom domains, Scheduled Send, Snooze and third-party mail apps.
• Storage beyond the plan allowance is a paid add-on, up to 300 GB per user.
• Listed prices are tax-exclusive.

Zimbra

• Pricing is not published; Zimbra is licensed, and renewals go through an account manager.
• The FAQ calls the Open Source Edition end of life, with no updates or support.
• Features such as backup and restore, Zimbra Office and large-scale mobile sync need the commercial license.
• Chat and real-time collaboration are protected in transit only, not end-to-end encrypted.

Fastmail

Custom domains and extra addresses

Use domains you own for your addresses, buy one through Fastmail, or pick one of its free domains. Fastmail says each account can create hundreds of additional addresses.

Masked Email

Creates stand-in addresses so that sign-up forms and logins never see your real one. A Masked Email API lets password managers create them too.

Offline apps on every platform

Apps for Windows, macOS, Linux, iOS and Android, plus a browser app. Offline, you can read, draft and search mail and manage calendars and contacts.

Snooze, Scheduled Send and pinning

Snooze messages until they are needed, schedule sends for later, pin important messages to the top of the inbox and mute threads you do not want to follow.

Calendar and contacts

A built-in calendar with shared calendars and event invitations that can also display Google and iCloud calendars, and a contact list with VIP-only notifications.

Open protocols and import

Mail is reachable over JMAP, IMAP and POP, contacts over CardDAV and calendars over CalDAV. An import tool moves mail, calendars and contacts from another provider.

Zimbra

Mail, calendar and contacts

A web client with advanced and attachment search, personal and global address lists, group and resource scheduling, and tasks.

Two editions

Zimbra Daffodil (v10) needs a license, sold as Professional or Standard. Professional has additional features over Standard.

Desktop and mobile access

Zimbra Desktop for Windows, macOS and Linux, a Connector for Outlook on Windows, and ActiveSync on iOS and Android.

Standards-based clients

Works with IMAP, POP, CalDAV and CardDAV, so Thunderbird, Apple Mail and similar clients can connect.

Security and admin controls

Built-in anti-spam and antivirus, two-factor sign-in, LDAP or Active Directory, SAML sign-in and delegated administration.

Deployment options

Install on your own servers, run it in the cloud on AWS or OCI, or use a hosting partner, with multiple domains per install.

Fastmail

• Basic$3

  per user / month, billed yearly ($36); $4 billed monthly

  Business plan with 6 GB of storage per user, shared addresses and shared calendars. Custom domains, Snooze and third-party mail apps need Standard.

• Individual$5

  per month, billed yearly ($60); $6 billed monthly

  One private inbox with 60 GB of total storage, custom domains, Masked Email, offline support and access from third-party mail apps.

• Standard$5

  per user / month, billed yearly ($60); $6 billed monthly

  Business plan with 60 GB per user, addresses at a custom domain, shared addresses and calendars, Scheduled Send and third-party app access.

• Duo$8

  per month for 2 people, billed yearly ($96); $10 monthly

  Two private inboxes with 60 GB each, plus addresses, calendars and an address book the two can share.

• Professional$9

  per user / month, billed yearly ($108); $10 billed monthly

  Everything in Standard with 150 GB of storage per user and an email retention archive for legal compliance.

• Family$11

  per month for up to 6 people, billed yearly ($132); $14 monthly

  Up to six private inboxes with 60 GB each at a flat rate, with controls for managing users' storage, privacy and security.

Zimbra

Pricing could not be confirmed. See zimbra.com.

Fastmail

• Annual discount

  Save $12 a year on Individual with yearly billing

  Individual costs $60 for 12 months, the equivalent of $5 a month, against $6 when billed monthly. Paying yearly saves $24 on Duo, $36 on Family and $12 per user on the business plans.

• Other savings

  Lower rates on 2- and 3-year terms

  Paying for 24 or 36 months up front brings Individual to $114 or $168, the equivalent of $4.75 or $4.67 a month. The other plans have the same two- and three-year options.

Zimbra

No public discounts listed.