Popular: Data updated October 27, 2026

Categories

Internet1,356
Communication321
Audio & video898
Graphics & design539
Office & productivity1,124
Developer tools3,134
AI tools529
Security & privacy385
System tools3,114
Games523
Education & science239
Network & IT284

Postbox alternatives

Postbox is the power email app for busy professionals, like you.

Postbox, Inc. Email clients #14 Email clients

12 Windows apps in the same category as Postbox, ranked by what they have in common and by popularity.

  • Tuta Mail

    Tutanota is an email client with a strong focus on security and privacy that lets you encrypt emails on all your devices.

    Open source 362.261023.2 50.1K ↓ ★ 8K email
  • Proton Mail Bridge

    Use Proton Mail with your desktop email client

    Open source 3.27.1 26.2K ↓ ★ 1.6K email, mail
  • Mailspring

    Boost your productivity and send better email with Mailspring, the best mail client for Mac, Linux, and Windows.

    Open source 1.26.2 7.7K ↓ ★ 17.9K email, mail
  • eM Client

    Fast email client with full Gmail, Hotmail and other services synchronisation. Best replacement for MS Outlook or Thunderbird. Free version for Home users.

    Free 11.0.1054 98.1K ↓ email, admin, mail
  • MFCMapi

    Provides access to MAPI stores to facilitate investigation of Exchange and Outlook issues and to provide developers with a sample for MAPI development.

    Open source 26.0.26291.01 5.7K ↓ ★ 984 email, mail
  • Claws Mail

    The user-friendly, lightweight, and fast email client

    Open source 4.1.1-1 11K ↓ email, mail, client
  • Mozilla Thunderbird (en-US)

    Thunderbird is a free email application that is easy to set up and customize - and it's loaded with great features!

    Open source 158.0.1 email, mail
  • Zimbra Desktop

    Zimbra Desktop is a desktop email client that synchronizes your emails even when offline, so your mailbox is updated when you go online.

    Proprietary 4.50.0 9K ↓ email, admin, mail
  • Prospect Mail

    Unofficial desktop client for Microsoft Outlook

    Open source 1.2.1 592 ↓ ★ 544 email, mail
  • trojita

    IMAP e-mail client with lightweight GUI

    Open source 0.7 10.7K ↓ admin, mail, client
  • Betterbird

    Betterbird is a fork of Mozilla Thunderbird with additional features and bugfixes.

    Open source 153.5.0 44.3K ↓ email, mail
  • Pebble

    A local-first desktop email client for people who want a calmer, more private inbox.

    Open source 0.1.5 ★ 598 email, mail

Comparison

AppLicenceVersionUpdatedGitHub starsChocolatey downloads
Postbox Proprietary 7.0.56 July 19, 2022 — 17.5K
Tuta Mail Open source 362.261023.2 October 23, 2026 8K 50.1K
Proton Mail Bridge Open source 3.27.1 October 8, 2026 1.6K 26.2K
Mailspring Open source 1.26.2 October 22, 2026 17.9K 7.7K
eM Client Free 11.0.1054 October 8, 2026 — 98.1K
MFCMapi Open source 26.0.26291.01 October 19, 2026 984 5.7K
Claws Mail Open source 4.1.1-1 December 8, 2022 — 11K
Mozilla Thunderbird (en-US) Open source 158.0.1 October 21, 2026 — —
Zimbra Desktop Proprietary 4.50.0 September 24, 2026 — 9K
Prospect Mail Open source 1.2.1 April 1, 2026 544 592
trojita Open source 0.7 — 10.7K
Betterbird Open source 153.5.0 October 14, 2026 — 44.3K
Pebble Open source 0.1.5 September 9, 2026 598 —