5 Most Popular Open Source Email Clients for Apple macOS (2023)

Reviews, comparison, screenshots and more for the 5 most popular open-source email clients for Apple macOS.

Forward Email Team
Written by
Forward Email TeamVerified
Published
12/1/23
Time to read
Less than 5 minutes

Email Client Screenshots

⭐ RecommendedJavaScript & C++

Mozilla Thunderbird

⭐ RecommendedJavaScript & C++

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."

Mozilla Thunderbird is an open-source email client for Apple macOS and is written in the JavaScript & C++ programming language.
Proprietary

Apple Mail

Proprietary

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."

Apple Mail is a closed-source and proprietary email client for Apple macOS.
C (GTK)

Claws Mail

C (GTK)

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+..."

Claws Mail is an open-source email client for Apple macOS and is written in the C (GTK) programming language.
Objective-C

GNUMail

Objective-C

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."

GNUMail is an open-source email client for Apple macOS and is written in the Objective-C programming language.
C & GTK+

Sylpheed

C & GTK+

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."

Sylpheed is an open-source email client for Apple macOS and is written in the C & GTK+ programming language.

Email Client Comparison

NameDescriptionScreenshotPlatformsLanguageWebsiteWikipedia
Mozilla Thunderbird ⭐ RecommendedAccess all your messages, calendars, and contacts in one fast app. Screenshot
  • Apple
  • Windows
  • Linux
JavaScript & C++Website Wikipedia
Apple MailMail 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
  • Apple
  • Chrome
ProprietaryWebsite Wikipedia
Claws MailClaws Mail is an email client (and news reader), based on GTK+... Screenshot
  • Apple
  • Windows
  • Linux
C (GTK)Website Wikipedia
GNUMailAn email client for GNUstep. Screenshot
  • Apple
  • Linux
Objective-CWebsite Wikipedia
SylpheedSylpheed is a simple, lightweight but featureful, and easy-to-use e-mail client. Screenshot
  • Apple
  • Windows
  • Linux
C & GTK+Website Wikipedia