
Thunderbird
Mailbird
eM Client
Microsoft Outlook
Apple Mail
ProtonMail
Mailspring
The Power Email App for busy professionals, like you.

Gmail
Microsoft Outlook
Yahoo Mail
ProtonMail
AOL Mail
StartMail
Apple Mail
OptMsg is a private, secure, opt-in email service that gives you complete control over who can contact you. Only people you approve reach your inbox — everyone else goes to Trash. Your Inbox. Your Rules.

Which is more popular?
Website, pricing, platforms and company facts side by side.
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| Website | postbox-inc.com | optmsg.com |
| Pricing | ||
| Platforms | — | |
| Company | — | Startup from the United States |
| Listed in |
In their own words, as submitted to SaaSHub.


No description of Postbox yet.
OptMsg is a private, opt-in email service built for people and families — not businesses. Unlike free inboxes that let anyone reach you and profit from your data, OptMsg puts you in control: only people you approve reach your inbox, and everyone else goes to Trash. Why people switch to OptMsg:...
What each product offers, as listed by its team.


Possible disadvantages
An editorial look at what each product does well and who it suits.


Overall verdict
Why this product is good
Recommended for
Postbox is recommended for power users, professionals, and businesses that require advanced email organization features, customizability, and integration with other productivity tools.
Overall verdict
Why this product is good
Recommended for
Walkthroughs and reviews on video.
App Pick of the Week: Postbox
More videos
About OptMsg
How often each product is chosen within a category, 0–100% relative to the other.


Share your experience with using Postbox and OptMsg. For example, how are they different and which one is better?
External articles and on-site reviews we used to compare the two products.


Postbox is a tool that helps you to add dynamic data fields to responses and templates. It allows you to reuse HTML snippet within message replies. This Outlook mail client alternative app provides more than 25 design...
Outlook, an email client with a similar Microsoft interface and similar features to Thunderbird, should be considered by anyone using Microsoft Office. Many power users like PostBox for Windows and Mac, MailMate for...
Next up, on our list of the best Thunderbird alternatives, we have PostBox. It is accessible for Windows and Mac. It offers some advanced features as you can point out particular folders as favorites for quick action.
We have no reviews of OptMsg yet. Be the first one to post
When comparing Postbox and OptMsg, you can also consider the following products.

Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!
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Gmail is available across all your devices Android, iOS, and desktop devices. Sort, collaborate or call a friend without leaving your inbox.
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Mailbird is the best email client for Windows 7, 8 and 10
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Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
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eM Client is a fully-featured email client for Windows and macOS with a clean and easy-to-use interface. eM Client also offers features for calendars, tasks, contacts, notes, and chat.
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Web-mail with a terabyte of free storage space & spam protection. Yahoo!
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