Alternatives to K-9 Mail

Thunderbird

Thunderbird is an open source, cross-platform email client and news reader developed by the Mozilla Foundation. It is designed to be powerful, yet easy to use and customize. It offers a range of features such as an address book, message organization, multiple account support, mes...

Microsoft Office Outlook

Microsoft Office Outlook is a personal information manager from Microsoft, commonly used as an email application, calendaring, task manager, contact manager, and note taking. It is part of the Microsoft Office suite of applications, included in the Professional and higher edition...

Spark

Spark is a cloud-based productivity suite that helps teams stay organized, collaborate, and get things done. It combines the features of traditional office productivity suites like Microsoft Office with cloud-based collaboration tools. It offers tools for creating documents, pres...

Zoho Mail

Zoho Mail is a cloud-based email service offered by Zoho Corporation, an online office suite provider. It provides a secure and reliable email hosting service with a host of powerful features, such as file attachment previewing, extensive search capabilities, email tracking, and ...

Claws Mail

Claws Mail is an open-source, free email client with a modern user-friendly interface. It can be used with multiple accounts in various formats, including POP3 and IMAP. Claws Mail offers a range of features to make managing your emails easier, such as customizable filters, suppo...

Mailspring

Mailspring is an open source email client for Mac, Windows, and Linux. It offers powerful features to help you manage your inbox, including a unified view of all your accounts, smarter search, snooze and follow-up reminders, and an integrated calendar to help you stay organized. ...

Opera Mail

Opera Mail is an email client from the makers of the Opera web browser. It allows users to access their emails from any computer, without the need to install any additional software. It supports all major email services, including Gmail, Yahoo, and Outlook.com. Opera Mail also su...

The discontinued Opera Mail is no longer updated and is no longer supported, but the latest version, 1.0.1044, released in February 2016, can still be downloaded from the official website.

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Airmail

Airmail is an email application that provides users with a powerful, fast and efficient way to manage their email accounts. It is designed to be a streamlined workflow allowing users to easily manage multiple accounts and quickly access their messages, contacts, and attachments. ...

Canary Mail

Canary Mail is an email app and website that offers a modern and secure way to access, read, and organize emails. It is designed to help users save time and be productive by bringing together the best of modern design and security. It offers powerful features such as email encryp...

FairEmail

FairEmail is an open source, secure, and private email app for Android and iOS devices. It provides users with a powerful yet simple way to manage their emails while keeping their data secure. With FairEmail, users can access their existing email accounts, including Gmail and Out...

TypeApp

TypeApp is a cross-platform office and productivity app that helps users manage their work and personal tasks easily. It has a powerful task manager, calendar and to-do list, note-taking features, and a contact management system. TypeApp integrates with popular services such as G...

BlueMail

BlueMail is an email app and platform that enables users to easily manage their email accounts from multiple providers in one place. It features a unified inbox, advanced notifications, and customizable options for managing emails, contacts, and calendars. BlueMail also integrate...

Aqua Mail

Aqua Mail is a powerful and highly customizable email app for Android devices. It supports multiple accounts, multiple identities, and a wide range of protocols, including IMAP, POP3, Exchange (with EWS), and SMTP. The app also offers a wide range of features, such as push notifi...

Hiri

Hiri is an intelligent email and calendar management system that helps users become more productive and organized. It is designed to help people prioritize their emails, schedule meetings, and keep track of tasks. Using artificial intelligence, Hiri pulls in emails, tasks, and c...

Nylas Mail Lives

Nylas Mail Lives is an app (or website) that allows users to access and manage their emails from all their accounts in one convenient place. It provides a unified inbox that allows users to view emails from all their accounts in one place and allows them to easily switch between ...

Discontinued On its github page, it indicates that it is archived and no longer maintained.

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Kube

Kube is an all-in-one productivity tool designed to make office work easier. It allows users to quickly manage their tasks, calendars, emails, and contacts in a single intuitive interface. Kube also provides powerful tools for collaboration, document management, and data analysis...

Agenda Mahala

Agenda Mahala is an application (or website) designed to help users manage their educational and reference needs. It provides a comprehensive view of user's academic and reference materials, allowing them to easily track their progress and maintain an organized academic schedule....

Koma-Mail

Koma-Mail is an all-in-one office and productivity app that helps you stay organized and stay in touch. It offers a comprehensive set of features, including email, calendar, contacts, notes, and task management, as well as a suite of collaboration tools. You can access your email...

The development of KOMA Code applications stopped in January 2017. The latest version of Koma-Mail, version 3.83, released in March 2012, can still be downloaded from the official website.

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SlideMail

SlideMail is an application that provides users with a secure way to sync, backup, and share their data across multiple devices. Through SlideMail, users can securely and easily access their files, folders, and other data stored on their device regardless of where they are. The a...

TrulyMail

TrulyMail is an all-in-one secure communications platform designed to make it easier to communicate securely with friends and colleagues. It provides a variety of features, including secure email, file and photo sharing, instant messaging, and encrypted voice and video calling. I...

Discontinued The program is no longer developed. The latest version, 6.0.2, released in January 2017, can still be downloaded from SoftPedia.

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K-9 Mail

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Alternatives