Thunderbird vs Postbox

Gmail

Google Workspace

Microsoft Outlook

Gmail is a free, advertising-supported email service offered as part of Google Workspace (formerly G Suite), with 15GB of storage, color-coded inbox filters, and 'unsend' button

Google Workspace is a suite of applications from Google which offers a number of tools to communicate and collaborate with colleagues, store files, and manage data from all devices.

Microsoft Outlook is a personal information manager from Microsoft which helps users communicate, manage schedules & find what they need quickly & easily

Thunderbird is an on-premise email management platform designed to help businesses securely handle, search, organize, archive, and filter email conversations from within a unified platform. The Mail Account Setup Wizard allows professionals to set up existing user accounts with information, such as email address, name, and password.


Activity Dashboard

Alerts/Notifications

Archiving & Retention

Contact Management

Inbox Management

Mobile App

Multiple User Accounts

Response Management

Search/Filter

Signature Management

Spam Blocker

Tagging

By industry, Thunderbird reviewers are most commonly professionals in information technology and services (15%). The most frequent use case for Thunderbird cited by reviewers is email management (100%).

Users and use cases

Most reviewers indicate that Thunderbird provides excellent value for money, as they appreciate its free and open-source nature with no paywalls. Some reviewers feel its free features rival paid alternatives, despite lacking certain advanced options.

Value for money

Thunderbird is an email management program offering key features such as inbox management and search/filter capabilities, among others.

Open Source

Thunderbird

Windows

Linux

Zoho Mail

Mailbird

Yahoo Mail

Free

Prokurist

The calendar integration works smoothly, and features like filters, folders, and tags make daily email management efficient.

Cinema operator

We use it to manage all our work emails in a fully secure environment.

Software developer and support

I mean, being able to read send email and received in a unified way as in GMail)

Developer

Sometimes it is difficult to find the way to access some of its features.

One of Thunderbird’s biggest strengths is how easy it is to handle several email accounts at once.

Thunderbird is lightweight but still powerful enough for professional use.

Adjunct Professor

In the case of Thunderbird, you can find a robust email client with functionalities at the level of many other paid clients. If I need to list Thunderbird's advantages, I will start by talking about its extensibility, making it one of the first email clients you can improve and customize with free third-party add-ons.

CVOR Consultant

I like the ability to use and even build plug ins and add ons to enhance the experience.

Consultant

Adding in calendar and task list to compete with Outlook was unnecessary.

Software Analyst

We started using Thunderbird as an alternative for our outlook clients, performing even better during the days, and making it a go-to software for our new installations.

If the best OSS email clients, it fast and almost without bug

Thunderbird is easy to use and offers valuable customer support.

Educator

It is good inbox managment software for the smaller companies or solo enterprenuers, but when you need to optimize some processess in your organization, it may lack integration abilities.

Product Manager

It is a lot more robust than other free software

Coach

It offers all the features you might expect from a fairly lightweight email client.

so maybe it's better to say default styling is poor.

In general, my experience has been good, and I like this email manager tool.

Engineer

Creating and organizing your emails and folders is easy and intuitive.

Scientist

I opt to use other email clients over this as it is feature poor.

Anyway Thunderbird is a good program, but if you use a 365 email account I recommend Outlook instead.

Head of Brand and Innovation

Maybe too multi when you have a lot of accounts to manage.

Owner

Interface is a little clunky compared to competitors

Total control on your email in every possible configuration

SEO supervisor

Allows you to integrate and manage several accounts in one single space

CEO, IT Admin, Purchasing Decisions

Event notifications popup and often do not close when I click dismiss or prompt me to update the event.

Indie Game Developer

Sometimes syncing with some email services can be slow, especially with accounts that receive a high volume of emails.

The initial setup is simple and organizing emails via folders is intuitive, making it easy to manage multiple accounts.

Operations Analyst

Thunderbird Mail integrates well with other applications, such as calendars, to-do lists, and news readers, allowing users to streamline their workflow and manage their tasks more efficiently.

Support for Multiple Accounts: Thunderbird Mail supports multiple email accounts, allowing users to manage all their email in one place, reducing the need to switch between multiple email services.

Thunderbird Mail offers advanced features, such as message categorization, quick search, and email filtering, which make it easier for users to manage their email and prioritize important messages.

Head of Sales

The toolbar buttons could be lower to the actual inbox for less scrolling to action.

Verification expert 

Multiple account support: Thunderbird can manage multiple email accounts from different providers, including POP, IMAP, and Exchange.

It outperforms every other email client I have used.

Partner

secure (2) Quick loading (3) Scalable to multiple accounts for the same user (4) Alias feature (4) Multiple add-ons for advanced features

Cons:No real-time syncing: Thunderbird does not offer real-time syncing between multiple devices, so users need to manually sync their email and data.

Executive

These glitches mean I constantly have to mark emails as read/unread, but there is no button on the dashboard to do this (there is with Thunderbird Conversations, but it doesn't work half the time), so in between writing emails is usually one or two times of having to right click>mark>unread/read.

Lack of integration with another softwares that controls workflow.

Operations Director

Haven't found a better alternative to manage dozens of emails in one spot.

Also if there is an option you want included such as a calendar or todo list or whatever, it integrates easily with add-ons and tools.

Storage limitations: Thunderbird's storage capabilities are limited, so users may experience performance issues if they store a large amount of data.

Lead Technician

Occasionally I try Outlook again and I even wrote my own email program but always go back to TB..

Content Editor

The product is free to use and relatively easy to setup

Many users appreciate its security and privacy features, such as encryption, phishing protection, and spam filtering.

It archives and stores my past emails and keeps them where they can be searched and accessed at any time.

Security system engineer 

I dislike the fact that Thunderbird was more of a home use and not a business quality email client.

Thunderbird Mail is available for Windows, Mac, and Linux, so users can choose the platform that best suits their needs.

Parish Manager

I haven't really worked with any email software that have been as clunky and hard to use as Thunderbird.

HR Executive

Furthermore, it supports more than one email which can be quite interesting to manage multiple email inboxes at one place!

This means that users can view and modify the source code, and even contribute to the development of the program.

Email Client

Integrations

Security and Access Control

User Interface

Search and Filters

Installation

Features

Performance and Speed

Ease of Use

Pricing

Freelancers

Small Business

Mid-size Business

Large Enterprises

Most reviewers indicate that Thunderbird offers excellent value for money, emphasizing that it is completely free and open source, with no features locked behind a paywall or subscription fees. They appreciate its cross-platform compatibility, frequent updates, and the availability of numerous free add-ons, making it a cost-effective choice for individuals and small businesses. Users think its functionality rivals commercial suites without the associated costs. Some reviewers feel that while it may lack certain advanced features found in paid alternatives, its comprehensive free offering remains highly attractive for many use cases.

Mozilla

Postbox is an email management application that aims to enhance productivity. The application offers an interface that is reminiscent of Apple Mail, providing a familiar experience to users. However, it distinguishes itself with additional capabilities and tools to handle demanding workloads.

Routing

Whitelisting/Blacklisting

Proprietary

Postbox

eM Client

Microsoft 365

Shift

None

The email client stands out with its intuitive interface and powerful features designed to enhance productivity.

Retired Homeopath

I appreciate the ability to save emails in folders of my choice.

Emails do not display .webp images, this is very annoying.

flexibilty and easy to use, also the custom tags that you can add

Translator

No problem at all to check and read mail...

Producer

Also, it does not separate clearly how old emails are, it would be great to have a divider between each day's emails,  just so it shows more clearly.

founder

Additionally, the software integrates with popular productivity tools, such as zapier, dropbox, etc, making it easy to manage emails in the context of other tasks and projects.

I can make changes to suit my needs very quickly, without having to navigate a whole load of items that are not required.  

sound engineer

stars for developers and for Customer Service that hepled me from time to time with new features and some minor problem with my system (for example my fonts on windows crushed and CS helped me to find solution althrough it was not their job, e-mails with Georgia font was problematic).

President

Very easy and clear to use, grouping of email addresses by function, grreat archiving of emails (more than 10 years for us)

Director

Simple to use, great to separate work and personal emails

I love that you can add RSS feeds right there in your mail box.

Overall, Postbox is a powerful and customizable email client that offers a wide range of tools to help users manage their inboxes.

Marketing Manager

Having e-mail addresses from our three domains, two businesses and personal e-mail, makes this a life saver, and something not possible in Oulook 2019.

Bookkeeper

Great email client for both imap and pop accounts

Ph.D. Student

They are saying they would refund the fee, if your problem is due to a bug, but still it does not make sense to get a support from a paid app with an extra fee.

owner

very reliable and customizable, never lost a mail in 10 years

As somebody who has cerebral palsy, the scroll bars implemented in v. 7 of Postbox slow me down, and are unnecessary.

The cost is what I like least about Postbox.

Nothing

Product Designer

Most of the time, I am working on my emails on my Mac, therefore I decided to go on the hunt for a powerful email client to work through my open emails. Since ProtonMail uses end-to-end encryption there are very few email clients available that can be used with a ProtonMail account.

I use their app day by da within last 2 years and I am more than happy after transition from Thunderbird, Outlook,  eM Client and after tested some more others...

Engineering Consultant

The clearly and logical structured user interface that never leaves you wondering where the function you are looking for might be hidden.

Retired engineer - future home inspector 

Signature block location in email replies or  when forwarding emails.

The lack of read receipt options is also a major let down, and somewhat surprising.

They also have a lifetime license option and the app is continuously receiving updates.

Distinguished Service Professor

I've used Postbox for many years, but as my number of saved emails has accumulated, I need to be able to categorize them individually so this "feature" is increasingly leading me to consider other email software options.  

Everyday user, multiple accounts (15) are managed simultanoesly.

Simple, fast, with all things you really need.

I like that it is very user-friendly, simple to use and does what I need.  

So far cannot find a way to import my contacts from the terrible eM client!

I have tried all mail clients on MAcOS, but Postbox remains the best.

Administrator

A big advantage is a very good "3-pane-view" and the quick filters for "unread" or "with attachement" or VIP persons.

The most annoying feature for me is that selecting a topic for a message will add that topic to the entire message conversation.  

They try to charge you $8 per incident for the support.

They provide student discounts which is a big plus.

investor

Like all third party products, occasional glitches with Apple and/or Google mail servers, since Apple and Google don't always closely follow all the IMAP rules.

Retired

The tiny little line at the bottom of the screen is very hard to read!

I then moved email accounts to Gmail and that also comes with it's limits and I was not always sure that my emails were arriving.

Online Educator

Postbox has allowed me to aggregate all of my email messaging into one place and keep my messages and attachments all organized in one easy-to-use and reliable local work area.

English Teacher

The fact that the junk mail does not work well and still puts categorized mail in junk.

manager

More ideal if it worked hand in hand with particular mail-servers to enable config sharing for web-mail and/or client scriptability and custom columns similar to how Directory Opus does for Windows Desktop.

I have compared this product to the defunct IncrediMail.

Senior Designer

So user friendly and didn't cost an arm and a leg to purchase.

Thunderbird vs Postbox Comparison (2026)

Thunderbird

Postbox

Overview

Video & Screenshots

Pricing

User reviews

Key features

Integrations

Alternatives