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App 3 installs/mo

Letter Opener for Mac

Display winmail.dat files directly in Mail.app

Quick answer: Letter Opener is a utility for macOS. Install it with brew install --cask letter-opener. The licence is not declared in Homebrew metadata. It has 3 Homebrew installs in the last 30 days.

What Letter Opener is

Letter Opener is a utility for macOS: display winmail.dat files directly in Mail.app.

It is distributed as a Homebrew cask, which installs a .app bundle into your Applications folder. Homebrew only automates the download and install step; the licence terms come from the vendor.

How to install Letter Opener

  1. Open Terminal (press ⌘ + Space and type “Terminal”).
  2. If Homebrew is not installed yet, run the installer below once.
  3. Run brew install --cask letter-opener.

Homebrew installer, if you need it:

Prefer a graphical installer? Download it from the official site. MacPicks never hosts or mirrors binaries — the Homebrew command always pulls from the vendor's own release.

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Frequently asked questions

How do I install Letter Opener on Mac?

Run brew install --cask letter-opener in Terminal. This requires Homebrew; if you do not have it, install it first with the command below.

Is Letter Opener open source?

Homebrew's metadata does not declare a licence for this app, so the official site is the authoritative source.

Does Letter Opener run on Apple silicon?

Yes, as a universal binary.

How popular is Letter Opener?

It was installed 3 times in the last 30 days according to Homebrew analytics, ranking #10094 in this catalogue.

What version of Letter Opener is current?

The latest packaged version is 16.0.7.