Postbox Alternatives (January 2026)

The Power Email App - Postbox

https://www.postbox-in.com/

Postbox is the power email app for busy professionals, like you.

4.6/5

631+ reviews

Reviewed on:

Mailspring - The best free email app

https://www.getmailsprin

.com/

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

BlueMail - The Best Email App for Windows, Mac, Linux, Android and iOS

https://bluemai

.me/

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.

Boxy Suite 2 - The best Gmail app for Mac

https://www.boxysuit

.com/

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

Thunderbird — Free Your Inbox. — Thunderbird

https://www.thunderbir

.net/

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

Spark Mail — Smart. Focused. Email.

https://sparkmailap

.com/

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

Secure and Private Email Hosting Services by Runbox

https://runbo

.com/

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

A Modern Email Platform That Works For You | Polymail

https://polymai

.io/

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!

Mailbutler: Your inbox, smarter.

https://www.mailbutle

.io/

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

Best free Email client Software for Businesses / Windows and MacOS - Mailtrim

https://www.mailtri

.com/

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