InLook is a small, fast viewer for .eml email files (the standard RFC 822
/ MIME format used by Outlook, Thunderbird, and most other mail clients
when saving a single message to disk). It renders headers, body (HTML or
plain text), and attachments, with embedded HTML sandboxed under a strict
Content Security Policy — no remote loads, no tracking pixels. Follows
the system light/dark theme, registers as the default .eml handler, and
never touches the network. Free Software from Struis ICT.
Publisher’s description
What is InLook?
InLook by Struis ICT is open-source Windows software in the email clients category. It is written in Rust.
Installation and requirements
The publisher provides MSI installers for 64-bit Windows. Installation asks for administrator rights. A silent install is possible with the installer’s documented switches. An MSI package is available for deployment with Group Policy, Intune or Configuration Manager.
Updates and version history
The current version is 1.2.1, released on August 28, 2026. The version history goes back to May 25, 2026: 10 releases, all linked to the official files.
Popularity and file types
The source code on GitHub (StruisICT/InLook) has 2 stars. Similar programs include Tuta Mail, Proton Mail Bridge and Mailspring.
Project description on GitHub: “EML Viewer”
Pros / Cons
Pros
- Open source: the code can be inspected and built by anyone
- MSI package for managed deployment
- Documented silent install
Cons
- No native ARM64 build
- Installation needs administrator rights
In short: InLook is an open-source email client tool for 64-bit PCs. Administrators can deploy it unattended.
Is InLook safe to download?
- The file is served by github.com, the publisher’s own domain
- The download link uses HTTPS
- A SHA256 hash is published, so you can verify the file:
734E734820EBC852D994D946870064671FC1F0F3BDAE95DFC577F751A56EFED6· Open the VirusTotal report for this hash - The link has not been checked yet
- The source code is public
- ExeAtlas does not host, wrap or modify installers
Related guide: How to check a file’s SHA256 hash on Windows
Recent versions
All 10 versions ›| Version | Date | Size | Files |
|---|---|---|---|
| 1.2.1Latest | August 28, 2026 | — | 64-bit MSI |
| 1.2.0 | August 22, 2026 | — | 64-bit MSI |
| 1.1.2 | August 21, 2026 | — | 64-bit MSI |
| 1.1.1 | August 7, 2026 | — | 64-bit MSI |
| 1.1.0 | August 4, 2026 | — | 64-bit MSI |
| 1.0.0 | July 21, 2026 | — | 64-bit MSI |
| 0.9.0 | July 17, 2026 | — | 64-bit MSI |
| 0.7.0 | July 14, 2026 | — | 64-bit MSI |
Install from the command line
Silent install ›winget install --id StruisICT.InLook -emsiexec /i inlook-1.2.1-x86_64.msi /qn /norestartmsiexec /x {A24F9D1E-9574-45C7-83EF-53E928589EEE} /qn /norestartRelated guide: How to use winget: install and update apps
Information
- Publisher
- Struis ICT
- Category
- Email clients
- Licence
- MIT OR Apache-2.0
- Price
- Free
- Source code
- github.com/StruisICT/InLook
- Written in
- Rust
- Requires
- Windows 11 / 10
- Architecture
- 64-bit
- Installer
- MSI
- Version
- 1.2.1
- Released
- August 28, 2026
- Added to the catalogue
- June 13, 2026
- Versions listed
- 10
- GitHub stars
- 2
- Website
- github.com
- winget ID
- StruisICT.InLook
- MSI product code
- {A24F9D1E-9574-45C7-83EF-53E928589EEE}
Ratings and reviews
No reviews yet. Be the first to rate it.
Alternatives to InLook
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Frequently asked questions
Is InLook free?
Yes. InLook is open-source software under the MIT OR Apache-2.0 licence.
Is InLook safe to download?
The download comes from github.com, which belongs to the publisher; ExeAtlas does not host or change the file. Compare its SHA256 hash with the one shown here, or open the VirusTotal report for that hash.
How do I install InLook with winget?
Open PowerShell or Windows Terminal and run the winget command shown on this page. winget downloads the official installer and checks its SHA256 hash before running it.
Can InLook be installed silently?
Yes. The silent install page lists the exact command for each installer, including msiexec for the MSI package.
Does InLook run on ARM (Windows on Arm)?
There is no ARM64 build; Windows 11 on Arm can run the 64-bit version through emulation.
Where can I download an older version of InLook?
The versions page lists all 10 versions with links to their official installer files, back to May 25, 2026.
What are alternatives to InLook?
Tuta Mail, Proton Mail Bridge, Mailspring, eM Client and MFCMapi. The alternatives page compares them.
