Postbox Alternatives (September 2025)

Mailspring: The open-source, extensible email app for Mac, Linux, and Windows with open tracking, link click tracking, contacts enrichment data and more.

BlueMail is a modern, mobile and desktop, powerful Email management tool with a sleek design, unified inbox and support for all your accounts: IMAP, Exchange,POP3.

Thunderbird is a free email application that’s easy to set up and customize - and it’s loaded with great features!

Mailtrim provides secure Free email client software with its unique team collaboration Feature and is designed to serve the mailing needs of all business

Spark helps you take your inbox under control. Instantly see what’s important and quickly clean up the rest.

You'll never look at email the same way again. Eight years ago, we first reimagined email. Now, we've done it again. Request early access today.

Newton supercharges your email with powerful features like Read Receipts, Send Later, Snooze & more. Works with Gmail, Google Apps, Exchange, Outlook, Office365, iCloud, Yahoo & IMAP.

Looking for a great Gmail app for Mac? Connect your Calendar, Keep and Contacts within one app.

Clean and organize your messy mailbox with a bulk email cleaner app - Clean Email. Choose your email provider to start cleaning.

Mailbutler is the email software extension plugin for Apple Mail, Gmail, and Outlook that helps you stay productive and professional.

The fastest email experience ever made. Blazingly fast, delightful, and stress free. Get 4 hours back every single week.

Email made easy and beautiful. Manage multiple accounts with the best email client for Windows 2024. Download the #1 email client program free Now.

Fast, secure, and sustainable email services provided by email professionals. Powerful Email and Domain Hosting for businesses and organizations.

Canary learns how you email. It can write your emails, surface what needs attention, silence spam, and much more. Say hello to your Inbox Copilot.

Supercharge your productivity with AI writing, search, scheduling, and more

TypeApp - The best Android and iOS email app ever created for mobile devices. Fast, simple and easy, TypeApp is the best email app for Android and iOS

Hiri is the best email client for Managers on Windows, Mac and Linux.

InMoat puts you back in control of your inbox. Tailor your inbox with readymade email filters, designed by experts, and let your inbox work for you. Win back time, maintain focus, and be more productive.

Keep your team in sync – Attach emails to cards and reply from Trello. Cards move when you get a response. 100k+ installs. Free!

MaxBulk Mailer is a bulk email software and email marketing tool for macOS and Windows that allows you to send out customized press releases, price lists or any kind of text or HTML messages to your customers.

The smarter, faster way to clean out your inbox. Remove hundreds (or even thousands) of messages from your inbox all at once. You'll be amazed at how fast you can approach Inbox Zero!

Mailman is an email assistant that helps you get your inbox to zero. It acts as a tool for time management and productivity by shielding you from unimportant emails.

Create, access and manage mail from all your emails accounts in one place. Add images, scan documents, create sketches and attach files using the handy Format B…

Polymail is the best email platform designed to make the work-life of any professional much easier. Offering tools and features that benefit you. Visit us now!

EverDesk combines the best features of an Email Client, File Manager, Address Book and Calendar into one integrated interface, making it the most unique and comprehensive personal information manager on the market

More than 250,000 professionals use Right Inbox every day to increase their email productivity. 12 powerful features to supercharge your Gmail account.

Postcards is a free email template builder with a no-code editor, allowing for quick email newsletter creation. Design, develop, and collaborate all on one platform.

MailMaestro is an AI-powered email assistant for Outlook & Gmail that helps you stay on top of your email and ensure the quality of every message you send. Try it for free now!

Fast, private email hosting for you or your business. More productive, lightning fast, simple and built to save you time.

Take back control of your email with this easy-to-deploy mail server in a box.

Cut your team's email management time in half & get started on the road to a cleaner inbox and more productive day with SaneBox. Start your free trial now!

Fast email client with full Gmail, Hotmail and other services synchronization. Best replacement for MS Outlook or Thunderbird. Free version for Home users.

Forget searching through junk, spam, and unsolicited emails to find what you actually need. Bulletproof turns your open-access inbox into a permission-based one.

The best app that helps you to simplify your workspace. Organize all your apps and profiles and boost your productivity with Rambox.

Securely archive, search, and analyze your company's email on one platform, preserving vital data while gaining instant business insights.

K-9 Mail is an open source email client focused on making it easy to chew through large volumes of email

Elevate your Gmail & Google Workspace with Kiwi for Gmail. Quickly access Docs, Sheets, Slides and Drive apps with one powerful desktop office suite - Now on both Mac and Windows! Get started now.

Feature-rich browser for productive working on the web. Tab manager, multi-account sign-in, unified search, workspaces and more

Parcel streamlines your development workflow to help you rapidly code high-quality emails. Get started for free!

Discover your new all-purpose inbox. Write emails, create notes, set reminders and assign to-dos—your everyday tools, in Twobird.

RainLoop Webmail - Simple, modern & fast web-based email client.

Emails, calendars, contacts, tasks, chat and more

Organize and streamline all your tabs and apps with the Shift browser.

Gmail, Outlook, and Apple got complacent and took their eye off the ball. Then along came HEY.

Dossier is an app for organizing customer conversations, no matter where it happens, with zero disruption to the ways you already communicate. Based in San Francisco, Dossier is helping business owners, business professionals and teams around the globe intelligently sync their customer communication channels and organize documents, tasks and more. Welcome to a new way to build better customer relationships and a better business.

Loops makes email marketing for modern SaaS companies easy. It's the best way to create, send and track beautiful email campaigns.

EssentialPIM helps you manage your life with powerful tools for email, calendar, contacts, notes, password entries and tasks.

Sign in to your Outlook.com, Hotmail.com, MSN.com or Live.com account. Download the free desktop and mobile app to connect all your email accounts, including Gmail, Yahoo, and iCloud, in one place.

Easy to Install and manage, carrier class Mail Server Software with modern fast WebMail interface, spam protection and much more.

Shared inbox for a transparent workspace—Zoho TeamInbox lets you manage team emails efficiently, gives you clutter free inboxes and helps attain Inbox Zero easily.

Email, group chat and tasks for productive teams. One app for all your internal and external communication. Work management at its best. Try it free!

Free Email Tracking Trial lets you track email, recall email and modify sent email. You get Free, unlimited Read Receipts and Confirmations when email gets read. Find out When, Where for How Long recipients read your sent emails

Leading mail server and webmail client, XGenPlus offering fast, secure, and reliable emailing services supporting linguistic domains - World's first enterprise email solution.

Use FileChimp to file emails from Outlook. Automatic and selective email filing to destination folders or sub folders on local or network drives.

Streamline your emailing and boost your sales with Mailjet. We serve all your email and SMS needs with one simple and powerful service.

Secure E-Mail Boolebox: to send and receive encrypted messages and attachments using the advanced security features of Boolebox. Learn more!

Sortd is an All-in-one Sales, Service and Task tracking app ‍for Gmail-based Teams. Manage your emails, customers, tasks and workflows, in your Inbox.

CloudFiler, secure and easy email filing for all devices running Microsoft Outlook

Clean Inbox for Gmail™ | A Gmail addon with GPT powered filters to avoid unwanted email, spam and marketing email.

Proton Mail is the world’s largest secure email service with over 100 million users. Available on Web, iOS, Android, and desktop. Protected by Swiss privacy law.

Host your professional email on a secure, privacy-guaranteed, and ad-free email hosting service built-in with features like email marketing services can do.

Create beautiful responsive email templates easily with drag and drop email builder. Design now with no registration. App embedding available as plugin.

Elevate your marketing with Mailbox Power’s automated platform, designed to streamline direct mail and gift campaigns. Effortlessly schedule, send, and manage your direct mail pieces or personalized gifts over any timeframe. Our comprehensive service takes care of packaging, timing, and mailing, freeing you from the hassle of post office visits. Experience seamless direct mail and gifting solutions that save time and enhance your outreach. Say goodbye to manual processes and hello to efficiency with Mailbox Power.

Manage and email your subscribers for far cheaper with EmailOctopus. Drag and drop email builder, powerful analytics, bounce/complaint tracking and more.

Compatible with macOS 10.12 and later. Connections to Amazon S3, Google drive, Dropbox etc. Support WebDav, SFTP etc. Navigate, transfer, and organize files with ease on your macOS system. Powerful File Management and FTP Capabilities.

Email Mailing List Manager. Easy To Use and Extendable

Inbox Zero is your AI personal assistant for email and the quickest way to reach inbox zero. Automate your email, bulk unsubscribe from newsletters, block cold emails, and view your email analytics. Open-source.

Encrypt ANY Business or Personal Email in a few minutes. No need to switch email providers. Free encrypted email for Gmail, Yahoo, Microsoft.

Enterprise-strength tool for automating both mass-mailing and single email processing jobs.

Modern, native client with intuitive GUI tools to create, access, query & edit multiple relational databases: MySQL, PostgreSQL, SQLite, Microsoft SQL Server, Amazon Redshift, MariaDB, CockroachDB, Vertica, and Redis.

With ActiveInbox, you'll take control of Gmail by turning emails into tasks, putting them into folders, adding notes and achieving inbox zero.

Exchange business-class email helps increase user productivity while protecting your data. Get it as a hosted service or run it on your servers.

Try ClearContext Free. ClearContext is a powerful email management tool that helps you to quickly file emails, organize and complete tasks and manage your projects.

Send personalized mass emails, directly from Gmail. Track your results in real time. Follow up easily and get more replies.

Unlock your productivity superpower with a multilingual AI Keyboard, supercharged AI Chat, Smart Notes, and state-of-the-art Transcription.

Professional and beautiful font manager and font organizer app, helps preview, sync, install and organize fonts over iCloud, Dropbox. All-in-one Font Manager for business.

Award Winning Mail Backup / Archiving & Migration Tool for Mac & Windows PC. Mac Mail, Outlook for Mac , Office 365, Thunderbird, Postbox, Gmail, Yahoo, gmx.de.

Unlock the power of Blocks - the ultimate AI-powered no-code email builder. Craft visually appealing emails without any coding skills. Try it today!

Macsonik Office 365 Email Backup Tool for Mac is the perfect solution to back up & restore Office 365 emails. It provides backup users mailboxes, primary & in-place archive mailboxes.

Mailfence is the only secure and private email service that gives you control. A free, interoperable encrypted email service protected by Belgian privacy law.

OX Cloud Email - Easy, Fast, Secure - Powerful email built for business

Our email contact management software Chaos Intellect can share your data across your network, organize your telephone book, appointment calendar and task list. Easy to work with and no expensive server software required!

TextExpander is the most popular text replacement and shortcut app. Generate custom word, sentence, and paragraph text with keyboard shortcuts.

Email Meter is an email analytics tool for Gmail, Google Workspace and Microsoft 365 that gives teams and companies visibility into their email communications.

Loop Email unlocks teamwork right inside your email inbox. It's an all-in-one shared inbox that transforms email into your team’s superpower.

Professional video editing, color correction, visual effects and audio post production all in a single application. Free and paid versions for Mac, Windows and Linux.

Easy and quick! Drag and drop HTML editor and builder for beautiful responsive email templates. Design, organize, and collaborate!

Clay is a beautiful rolodex and CRM for iPhone, Mac, Windows, and web, built automatically to help you manage your personal and professional relationships.

We are the Experts in Email Archiving: Innovative Email Archiving Solutions for small and medium-sized Businesses.

Start building AI-powered applications using tools from Microsoft. Discover Power Apps and find all you need to build the AI-powered app solution for your organization.

Zimbra: A Cloud-Hosted Collaboration Software and Email Platform That Integrates With Proprietary Business Solutions

Take control of your email service with the market-leading email infrastructure. Boost your competitive edge and provide a leading user experience.

Seamlessly handle your traditional mail online. Select from our wide range of nationwide mailing addresses. Scan and access your mail at your convenience, from anywhere, and at any time.

HCL Notes is the email client software that supports social collaboration. Integrates enterprise applications in a single workspace with agile security from the core.

Mailercloud is the ultimate platform for growing businesses, offering smart and intuitive email marketing tool to help you thrive in the digital world.

EmailFlow Outlook add-in helps you simplify and expedite your email reviewing process for all your professional emails directly from Outlook.

Discover powerful applications such as Little Snitch Mini, Little Snitch, LaunchBar and Micro Snitch.

A powerful email server that blocks 99% of junk emails. It also enables encrypted emailing with large sized file sharing and helps in preventing IP leakages

Newsletter software for people like you.