Mailbutler is well suited to people who predominantly use their Mac for email. It adds a rich feature set to macOS Mail's native features. Mailbutler is less useful to people who frequently process email on iOS/iPadOS. Only a limited subset of Mailbutler's functionality is available on iOS/iPadOS as Apple doesn't currently provide a way for third parties to extend the iOS/iPadOS Mail app.
It fills the gap between large commercial softwares for large companies, and for small companies. Most email hosts are just basic until you start bringing in video calls, chat, etc. Missive has that and more, and I think is the #1 email choice for small companies.
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Mailbutler occasionally conflicts with other macOS Mail plug-ins. Though, in most (if not all) cases the issue tends to be with other plugins.
The Mail app for iOS/iPadOS doesn't support plugins, making it necessary to use Mailbutler's own app to access a limited subset of the functionality on macOS/iPadOS.
I'm not aware of any other products that provide the same functionality within the macOS Mail client. There are some third-party email apps for macOS and iOS/iPadOS that have some of Mailbutler's features, but my preference is to stay with Apple's Mail client, partially for security reasons.
I can only compare to free services or to Outlook. I cannot go back to Outlook... Truly. Outlook hits all the right marks for a business, and Missive exceeds those marks and sets new standards. I joined a company that had already chosen Missive. I not only was able to pick it up intuitively, but I felt proficient at it within a couple of weeks and already felt my workflow and communication skyrocket.
A de minimis incentive was given to thank the reviewer for their time. The incentive was not used to bias or drive a particular response, nor was the incentive contingent on a positive endorsement. More Info
Overall efficiency in our communication has probably tripled. We can draw a collaborative conclusion, in-office or remote, desktop or remote, within minutes assuming we are all available.
We realize we are still "under-utilizing" this app. It can be a powerhouse if mastered.