Alternatives to K9mail.app - Similar Sites & Competitors
K-9 Mail
K-9 Mail is a free, open source email client that helps you manage and organize large volumes of email with ease on your mobile device.
Effortlessly manage your email on mobile
K-9 Mail is an open source email client designed to help you handle your inbox with ease, especially if you get a lot of messages. Its simple, user-friendly interface makes it easy to organize, read, and reply to emails right from your mobile device.
Whether you’re juggling multiple accounts or just want more control over your email, K-9 Mail offers powerful features without clutter. You can customize your experience, join a supportive community, and even contribute to the project if you’re interested in open source software. It’s a great choice if you want a reliable, flexible email app that puts you in charge.
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Roundcube is a free, open-source webmail client you use in your browser. It lets you manage your email easily with features like folders and address book.
Mutt is a flexible, open source email client for power users, offering advanced features and customization for managing email from the command line.
Thunderbird is a free, open-source email and productivity app that helps you manage email, calendars, and contacts on desktop and mobile devices.
Temp-Mail lets you create disposable email addresses instantly to protect your privacy and avoid spam when signing up for websites or services.
eM Client is an email app for Windows and Mac that lets you manage email, calendars, contacts, tasks, and chat all in one place.
MailTime turns your email into an easy-to-use messenger, making email conversations feel as quick and simple as texting. Available in multiple languages.
Superhuman is an AI-powered email app designed to help you manage messages faster, collaborate easily, and boost your productivity every week.
Check and verify email addresses for your website or app to improve deliverability, protect your reputation, and save on marketing costs.
Airmail is a customizable email client for iPhone, iPad, and Mac, offering fast performance, powerful workflow tools, and deep app integrations.
Mailbird lets you manage all your email accounts in one simple app for Windows and Mac, helping you stay organized and boost your productivity.
Cyrus IMAP is a free, open-source server for email, contacts, and calendar management, designed for reliable, secure, and flexible communication.
Get a free, instant disposable email address with Temail.pro to keep your real inbox private and avoid spam. No registration or sign-up required.
Send and receive emails as quickly as instant messages for faster, easier communication. Email Messenger streamlines your inbox for simple, chat-like email.
Create free, secure disposable email addresses to protect your privacy and avoid spam when signing up for online services.
Access your email securely through a simple web interface with Roundcube Webmail. Easily check, send, and manage your messages from any browser.
Log in to access your email account through szepe.net using the Horde webmail interface for convenient online email management.
Access your institutional email and communication tools for Scuola Superiore Sant'Anna through a secure online portal. Login required.
Halon offers advanced email infrastructure solutions for service providers, helping businesses streamline email operations and deliver reliable email services.
Send emails from your code without server setup. EmailJS lets you add attachments, use dynamic fields, and get started for free—no backend needed.
Ritlabs offers The Bat!, a secure email client for Windows that helps you manage large volumes of emails efficiently while keeping your correspondence private.
Shortwave is an AI-powered email platform that helps you organize, write, search, and manage your inbox tasks quickly and easily with smart prompts.
Get free, disposable email addresses instantly to protect your privacy online. No registration needed—create, manage, and delete temp emails with ease.
SocketLabs lets you send emails reliably and track their performance with easy tools for delivery, analytics, and secure sending—built for developers.
Create disposable email addresses and phone numbers for testing, 2FA, or marketing. Automate messaging with easy-to-use email and SMS APIs.
Nodemailer helps you send emails easily and securely from Node.js apps, offering simple setup, clear documentation, and no extra dependencies.
Mailu lets you easily set up and manage your own email server using Docker. It’s open-source and designed for simple, private email hosting.
Modoboa is an open source email server with a modern web interface, making it easy to manage email accounts, calendars, and contacts.
XgenPlus offers secure business email hosting for professionals and enterprises, providing advanced features for safe and reliable communication.
Riseup offers secure email, VPN, and collaboration tools for people and groups focused on social change and privacy-friendly communication.
Tuta offers free, ad-free encrypted email, calendar, and contacts to keep your data private and secure with advanced privacy features.
Worldwide K9mail.app Alternatives
iRedMail lets you quickly deploy a free, open source mail server solution with a full-featured web admin panel and email archiving options.
Download the latest version of Alpine, an email program offering updated features and security fixes for efficient email management on your computer.
Postfix offers reliable, open-source email server software with detailed documentation and resources for mail system administrators and developers.
R2Mail2 is an Android email client with built-in encryption and digital signature features for secure, private communication on your mobile device.
OK.de offers secure email and messaging services, making it easy to manage your communications online with privacy and convenience.
MoeMail 提供安全、快速的一次性临时邮箱，帮助您保护隐私、避免垃圾邮件，并支持邮件即时接收和自动失效。
Easily manage all your email accounts in one place with this Android app, featuring a simple interface and tools to help you stay organized and productive.
nununuMail offers a secure email service designed for smartphone users in Japan, supporting modern connectivity like 3G, LTE, and MVNO SIM cards.
Access your email and more securely with the Usermin Web Application. MartNet Support helps you manage messages and account features online.
Mandrill lets you send transactional emails triggered by user actions, like order receipts or password resets, as a paid add-on for Mailchimp accounts.
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