10 Best Postbox Alternatives and Similar Apps

10 Best Postbox Alternatives and Similar Apps

Discover the best alternatives to Postbox email client. From secure options like Canary Mail to versatile choices like Mozilla Thunderbird.

Alex Simmons

Alex Simmons | Jan 1, 2024 | 4 mins read

Postbox, a widely-used professional email client, has established its reputation through its powerful features and add-ons that boost email productivity. With versions for both Mac and Windows, the Postbox app delivers a complete array of email management software tools. However, it may not cater to the specific needs or preferences of all users. This article explores 10 alternatives to the Postbox email client, each offering a unique set of features and advantages.

1. Canary Mail

Topping our list of Postbox alternatives is Canary Mail. This email client stands out for its emphasis on security and privacy, offering end-to-end encryption and compatibility with various email providers. Despite its strengths, it falls short in terms of integrations and is not as widely recognized as some other brands.

Canary Mail is the best alternative to Clean Email

2. Opera Mail

Opera Mail, formerly a component of the Opera web browser, has evolved into an independent email client. It provides an intuitive user interface and effective search functionalities. However, its impending discontinuation and a somewhat limited array of features are notable drawbacks.

3. Mailspring

Mailspring is a sleek and high-speed email client that supports all major email providers. It boasts a unified inbox, customizable layouts, and powerful search features. While a Mailspring ID is required, and updates may be slow, it remains a compelling Postbox alternative with its modern interface and efficient email management tools.

4. Mozilla Thunderbird

Mozilla Thunderbird is a free, open-source email client that works across Linux, OS X, and Windows. It offers a strong filtering system, but its interface may feel outdated. Integration with macOS is also not its strong suit. Nevertheless, Thunderbird remains a dependable Postbox alternative, providing effective email management tools and cross-platform compatibility.

5. Microsoft Outlook

Microsoft Outlook, a comprehensive personal information manager included in the Microsoft Office suite, offers a robust built-in calendar and seamless integration with tasks. However, it’s not without its flaws, as some users have reported issues with bugs and frequent crashes. Despite these setbacks, Outlook remains a widely-used alternative to Postbox, providing extensive functionality for managing emails, calendars, and tasks within a unified platform.

6. Claws Mail

Claws Mail is a low-resource email client often defaulted in low-resource Linux distributions. It is open-source and offers many plugins for extra functionality. However, it blocks and freezes all the time and saves passwords in plain format.

7. ProtonMail

ProtonMail is an end-to-end encrypted email service founded in 2014 by scientists who met at CERN and were drawn together by a shared vision of a more secure and private Internet. However, it is Javascript-intensive and stores encryption keys server-side.

8. The Bat! Professional

The Bat! Professional is a secure and lightweight desktop email client for Windows, offering granular control over email security. However, its availability is limited to Windows users, and there have been reported issues with customer support and the new license policy. Nevertheless, The Bat! Professional remains a strong alternative to Postbox, prioritizing the protection of your correspondence against third-party interference.

9. eM Client

eM Client is a feature-rich email client that boasts a sleek and user-friendly interface. With its modern design, it provides a wide range of useful options and continues to receive active development. However, some users have reported sluggishness when opening emails and occasional syncing errors, particularly with Hotmail. Despite these challenges, eM Client remains a compelling Postbox alternative, delivering a comprehensive set of features for efficient email management.

10. Hiri

Hiri is a business-oriented email client that combines email, calendar, contacts, and tasks in one platform, enhancing email organization. However, it lacks support for POP3 accounts and has limited third-party app integration. Nevertheless, Hiri serves as a valuable Postbox alternative for efficient business communication and task management.

Conclusion for Postbox Alternatives

In conclusion, while Postbox is a robust and feature-rich email client, there are numerous alternatives available that cater to a variety of needs and preferences. Whether you prioritize security, ease of use, or advanced features, there’s an email client out there that’s perfect for you. 

Summarizing table of each Postbox alternative for easy comparison.

Email ClientKey FeaturesDrawbacks
Canary MailEnd-to-end encryption, Supports multiple email providersLimited integrations, Less known brand
Opera MailIntuitive user interface, Efficient searchBeing discontinued, Limited feature set
MailspringUnified inbox, Customizable layoutsRequires Mailspring ID, Slow updates and bug fixes
Mozilla ThunderbirdGood filtering system, Available on multiple platformsOutdated interface, Terrible integration with macOS
Microsoft OutlookGood built-in calendar, Integration with tasksBuggy, Crashes frequently
Claws MailLow resource client, Open-SourceBlocks and freezes all the time, Saves passwords in plain format
ProtonMailBuilt-in end-to-end encryption, No personal information neededJavascript-intensive Webmail, Encryption Keys are stored server-side
The Bat! ProfessionalFast and lightweight, Granular controlOnly available for Windows, Issues with support and new licenses policy
eM ClientMany useful options, Free and paid versionExtremely slow opening emails, Some syncing errors with Hotmail
HiriBusiness-focused, Integrates email, calendar, contacts, and tasksLacks support for POP3 accounts, Limited integration with third-party apps
Table with a quick comparison of the different Postbox alternatives.


Does Postbox have a calendar?

No, Postbox does not have a built-in calendar feature. It primarily focuses on email management and productivity tools.

Who owns Postbox?

Postbox is privately owned by Postbox, Inc., a company based in San Francisco, California.

Alex Simmons
Alex Simmons

I have always been fascinated by the world of SaaS and technology. From a young age, I found myself drawn to the endless possibilities that email technology offers. The ability to connect with people across the globe and streamline communication processes is something that truly excites me. As a passionate individual, I am constantly seeking new ways to leverage SaaS and email technology to enhance productivity and drive innovation.

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