Alternatives to Postbox
Power-user desktop mail (acquired by eM Client)
Postbox ranks #16 of 22 in Email clients, with an Alt Score of 63. It is proprietary, sold as a one-time purchase and available on macOS and Windows. 7 of 11 checklist rows are verified against a public source.
Mac and Windows users who managed multiple email accounts and wanted an advanced native desktop client rather than webmail — often power users migrating from Thunderbird or Apple Mail.
A single desktop inbox consolidating several email accounts, with keyboard-driven Quick Bar actions, extensive filtering and rules, drag-and-drop organization, and a customizable interface with a built-in theme editor. Postbox was acquired by eM Client, and standalone development has since wound down, with the vendor directing users to eM Client for continued support.
Users connected their email accounts to the desktop app, then read, filtered, tagged, and organized messages through customizable panels and keyboard shortcuts rather than a browser-based webmail interface.
Why people leave Postbox
Dashed reasons are sourced facts; the rest are opinions. Vendors can dispute.
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Ranked alternatives
Ordered by Alt Score. Click any score to see the breakdown.
Feature comparison
How Postbox compares with its alternatives, feature by feature.
| Email clients checklist | Postbox | eM Client | BlueMail | Canary Mail | The Bat! | Apple Mail |
|---|---|---|---|---|---|---|
| Pricing model | ||||||
| Starts at | ||||||
| License | ||||||
| Platforms | ||||||
| Protocols (IMAP / POP3 / JMAP / Exchange) | ||||||
| Unified inbox | ||||||
| Snooze & send later | ||||||
| Tracking pixel blocking | ||||||
| PGP / encryption support | ||||||
| Conversation view | ||||||
| Offline mode | ||||||
| Rules & filters (local) | ||||||
| Calendar integrated | ||||||
| Multiple identities/aliases | ||||||
| Keyboard-first shortcuts |
Every fact and feature listed for Postbox is verified against its own pages. Each alternative is sourced on its own page.
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Pricing model One-time verified 2026-07-12
Enter the email address used to purchase Postbox below:
https://www.postbox-inc.com/store/license-code-retrieval -
Platforms macOS, Windows verified 2026-07-12
macOS 10.13 through 15 / Windows 8 through 11
https://www.postbox-inc.com/product/system-requirements -
License Proprietary verified 2026-07-12
Licensee shall not, nor permit anyone else to, directly or indirectly: (i) copy (except for a reasonable number of backup copies), modify, or distribute the Software
https://www.postbox-inc.com/legal/eula -
Status acquired verified 2026-07-12
Postbox has been acquired by eM Client and is no longer in development or available for purchase.
https://www.postbox-inc.com/download -
Protocols (IMAP / POP3 / JMAP / Exchange) Yes verified 2026-07-12
Postbox supports IMAP, POP3, and SMTP servers
https://www.postbox-inc.com/features -
Unified inbox Yes verified 2026-07-12
Create separate groups to hold your 'personal' and 'work' accounts, then unify them into one view.
https://www.postbox-inc.com/features -
Tracking pixel blocking Yes verified 2026-07-12
Use Anti-Tracking to prevent pesky salespeople from knowing if and when you open a message.
https://www.postbox-inc.com/features -
Conversation view Yes verified 2026-07-12
Postbox gathers message fragments from multiple folders and presents them in a unified view
https://www.postbox-inc.com/features -
Rules & filters (local) Yes verified 2026-07-12
Postbox provides the most complete filtering rule sets on the market
https://www.postbox-inc.com/features -
Multiple identities/aliases Yes verified 2026-07-12
You can use identities (also known as 'aliases') to prevent junk mail from being sent to your primary email addresses.
https://www.postbox-inc.com/features -
Keyboard-first shortcuts Partial verified 2026-07-12
For our power users, Postbox supports a full suite of keyboard shortcuts.
https://www.postbox-inc.com/features
FAQ
Yes. eM Client, BlueMail and Canary Mail have a free tier or are fully free. Free-tier limits in the comparison table are verified and dated.
FairEmail, Evolution and Mailspring — every license claim links its source.