5 Most Popular Open Source Email Clients for Apple macOS in 2024
Reviews, comparison, screenshots and more for the 5 most popular open-source email clients for Apple macOS.
Email Client Screenshots
Mozilla Thunderbird
Mozilla Thunderbird is an open-source email client for Apple macOS and is written in the JavaScript & C++ programming language. The official description from its website says, "Access all your messages, calendars, and contacts in one fast app."
Apple Mail
Apple Mail is a closed-source and proprietary email client for Apple macOS. The official description from its website says, "Mail is an email client included by Apple Inc. with its operating systems macOS, iOS, iPadOS and watchOS... With Mail on iCloud.com, you can send and receive email from your iCloud Mail account using a web browser."
Claws Mail
Claws Mail is an open-source email client for Apple macOS and is written in the C (GTK) programming language. The official description from its website says, "Claws Mail is an email client (and news reader), based on GTK+..."
GNUMail
GNUMail is an open-source email client for Apple macOS and is written in the Objective-C programming language. The official description from its website says, "An email client for GNUstep."
Sylpheed
Sylpheed is an open-source email client for Apple macOS and is written in the C & GTK+ programming language. The official description from its website says, "Sylpheed is a simple, lightweight but featureful, and easy-to-use e-mail client."
Email Client Comparison
Name | Description | Screenshot | Platforms | Language | Website | Wikipedia |
---|---|---|---|---|---|---|
Mozilla Thunderbird ⭐ Recommended | Access all your messages, calendars, and contacts in one fast app. | Screenshot |
| JavaScript & C++ | Website | Wikipedia |
Apple Mail | Mail is an email client included by Apple Inc. with its operating systems macOS, iOS, iPadOS and watchOS... With Mail on iCloud.com, you can send and receive email from your iCloud Mail account using a web browser. | Screenshot |
| Proprietary | Website | Wikipedia |
Claws Mail | Claws Mail is an email client (and news reader), based on GTK+... | Screenshot |
| C (GTK) | Website | Wikipedia |
GNUMail | An email client for GNUstep. | Screenshot |
| Objective-C | Website | Wikipedia |
Sylpheed | Sylpheed is a simple, lightweight but featureful, and easy-to-use e-mail client. | Screenshot |
| C & GTK+ | Website | Wikipedia |
Why use us as your email provider?
What makes us different than others?
- We're the only 100% open-source provider
- We don't rely on any third parties (we don't use Amazon SES or an alternative like others)
- Our pricing allows you to scale cost effectively (we don't charge per user and you can pay as you go for storage)
- Unlike others, your email with us is not stored in a shared relational database alongside everyone else
- We're the world's first and only email service to use quantum-safe and individually encrypted SQLite mailboxes
Did you know?
Other email services advertise as open-source, but they do not release the source code to their back-end. The back-end is the most sensitive part of an email provider. It is also important to use 100% open-source because it builds trust and allows anyone to contribute and independently audit.