Best Open Source Email Apps

4 Best Open Source Gmail & Outlook Alternatives for Android

Open source email apps offer a great option for users searching for a more safe and adjustable way to manage their email. With the increase in issues concerning personal privacy, it’s more important than ever for users to be informed about their choices.

This post will look at some of Android’s top open source email apps. We’ll explore their features, discuss the benefits of using open-source email apps, and explain why they deserve to be considered an alternative to proprietary email apps.

Primarily, open-source apps are more privacy-respecting than proprietary apps since the source code is offered for anyone to evaluate, so users can see how their data is handled and choose whether or not to utilize the app. In addition, many open-source apps are regularly updated and backed by a community of developers.

Furthermore, open-source apps typically have more customizable choices, allowing users to tailor the app to their specific needs. Open source email apps are an excellent alternative if you’re looking for more powerful inbox management or security features.

Check out the 5 Best Open Source Apps for Note Taking

Best Open Source Email Apps for Android

K-9 Mail

K-9 Mail Open Source Email App
K-9 Mail Open Source Email App

Features: supports numerous email accounts and IMAP, POP3, and Exchange protocols. It includes many features, such as browsing, filtering, and syncing with third-party apps.

Usability: The app has a simple user interface to browse. However, it has a steep knowing curve for more advanced options.

User Feedback: Users usually find the app stable, feature-rich, and well-suited to their needs, but it’s quite outdated.

Download link: K-9 Mail


Fair Email Open Source Email App Android
Fair Email Open Source Email App Android

Features: FairEmail is a privacy-respecting email client with an open-source codebase that can be utilized with any email provider. Its features include search, filters, and support for multiple languages.

Usability: Simple user interface, simple to set up with excellent tutorials.

User Feedback: Users usually have favorable feedback about the app, applauding its security, personal privacy, and great UI.

Download link: Fair Email

Delta Email

Delta Email Open Source Email App
Delta Email Open Source Email App

Features: Simple, open-source, and ad-free email client for Android that supports IMAP, POP3, and SMTP procedures.

Usability: The user interface is clean and simple to browse.

User Feedback: Most users find the app simple and easy to use.

Download link: Delta Email

Newton Mail

Newton Email Open Source Email App
Newton Email Open Source Email App

Features: It has many options for power users, including checking out invoices and a schedule send feature.

Usability: it has a more complicated user interface than other apps, but it’s well-organized and easy to navigate.

User Feedback: Most users find the app effective and well-designed.

Download link: Newton Mail


All the apps discussed are open-source, have favorable feedback, offer special features, and are actively maintained.

K-9 Mail is a well-rounded email app with robust functions. FairEmail concentrates on personal privacy and security. Delta Email is basic, easy to use, and lightweight; Newton Mail provides sophisticated power-user features. Selecting which one to utilize depends upon the user’s specific requirements and choices.

Pros & Cons of Open Source Email Apps

There are numerous benefits and drawbacks to utilizing open source email apps for Android. Some considerable advantages consist of the following:


Personal privacy and security: Open-source email programs are typically more privacy-respecting than closed-source apps since the source code is offered for anyone to evaluate, enabling users to see how their data is being dealt with and make an educated decision about whether or not to use the app. Additionally, many open-source apps are routinely upgraded and maintained by a group of developers to be more stable and safe than closed-source alternatives.

Personalization: Open-source apps typically have more customizable options, allowing users to tailor the app to their specific needs and allowing users to take control of their email experience. Open source email apps are a fantastic option if you are searching for more powerful inbox management or security features.

App Support: Open-source apps are normally backed by a community of developers, so users can frequently find help and assistance for the app through forums or online communities.

Cost: Open-source apps are typically free to download and use, although some might have a paid version.

Nevertheless, there are likewise some significant drawbacks to using open-source email programs for Android.


User interface: Some open source email apps may have a less sleek interface or absence of particular features that exclusive apps use.

Technical knowledge: Some open-source apps need more technical knowledge. Especially with the configuration of the app

Few features: Open-source apps might not have all the features and the same performance as proprietary apps, making them less appealing to ordinary users.

Limited support: Open-source apps may not have the same level of assistance and documentation as exclusive apps, which could make them tough to use for some people.

In general, using open source email apps for Android provides several advantages, such as much better personal privacy, security, and modification. Nevertheless, they may not have the same features as exclusive apps and may need more technical knowledge. Users should weigh the pros and cons and consider their specific needs before choosing an email app.

How to choose the right open source email app?

Here are a couple of things to think about when choosing an open-source email app for Android:

Interface: Consider how simple the software is to utilize and whether it has an interface appropriate to your requirements.

Security and personal privacy: Look for email apps that focus on security and personal privacy, such as encryption and two-factor authentication.

Features: Determine which features are crucial to you, such as support for several email accounts, calendar integration, and the ability to compose and check out HTML emails.

Customizability: Some open-source email applications can be tailored to fit individual needs.

Compatibility: Ensure the software application is compatible with your Android version.

Community support: Look for an actively developed email software application with a strong community of users who can give support and answer concerns.

Scalability: Assess if the software application can handle your anticipated email traffic and scale in case you get far more traffic than anticipated.

Battery performance: Check if the software is battery friendly.

As soon as you have thought about these factors, you can begin looking into specific software choices and compare them based on how well they satisfy your individual preferences and personal needs.


When selecting an open source email app application for Android, it’s essential to consider factors such as user interface, security and personal privacy, functions, customizability, compatibility, community support, scalability, and battery efficiency. Thinking about these considerations will help users find email software application that fits their needs and choices.

The most popular android open source email apps alternatives are K-9 MailFairEmailNewtonMailDelta Email, and MailDroid. These apps are considered a few of the best open-source email apps for Android. They are known for offering a solid email client experience while enabling users to customize and improve their email experience. I recommend researching more about them and trying them to see which fits your needs best.

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