mfctl administers a MailFathom deployment over HTTP. It signs in against the deployment's administrative endpoint,
keeps a profile for each deployment you administer, checks that a stored credential still works, and completes the
OAuth authorization a mailbox needs — without ever reading the service's configuration, opening its database, or
touching its secret store.
MailFathom itself runs on Linux, as a container or as a native process, and synchronizes IMAP mailboxes into a
PostgreSQL database you own, indexes them, and serves them to AI agents over the Model Context Protocol. mfctl is
the client you administer such a deployment from, which is why it ships for Windows as well.
No mfctl binary carries a code signature. Every release publishes a checksum file covering all of them, and the hash
in this manifest is the one winget verifies the download against.
Publisher’s description
What is MailFathom CLI?
MailFathom CLI by MailFathom is open-source Windows software in the email clients category. It ranks 34th by popularity among email clients in this catalogue. It is written in C#.
Installation and requirements
The publisher provides Portable installers for 64-bit and ARM64 Windows. It runs without installation (portable).
Popularity and file types
The source code on GitHub (fathomise/MailFathom) has 16 stars. Similar programs include Tuta Mail, Mailspring and Proton Mail Bridge.
Project description on GitHub: “A brain for your mail: MailFathom turns IMAP mailboxes into a self-hosted, AI-native service. Mail synchronizes into your own PostgreSQL, is indexed for search and retrieval, and is served to AI agents over the Model Context Protocol. Semantic retrieval, answering, and gated write tools. .NET 10, AGPL-3.0-only.”
Pros / Cons
Pros
- Open source: the code can be inspected and built by anyone
- Native ARM64 build for Windows on Arm
- Portable: runs without installation
In short: MailFathom CLI is an open-source email client tool for 64-bit and ARM64 PCs.
Is MailFathom CLI 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:
24F0362C9A24DAD9627550950E2EE4FFFA376FDEB089B31AEB47074E04ABE6DB· 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 1 versions ›| Version | Date | Size | Files |
|---|---|---|---|
| 0.4.0Latest | August 8, 2026 | — | ARM64 Portable64-bit Portable |
Install from the command line
Silent install ›winget install --id MailFathom.mfctl -eProgram files (.exe): mfctl.exe
Related guide: How to use winget: install and update apps
Information
- Publisher
- MailFathom
- Category
- Email clients
- Licence
- Apache-2.0
- Price
- Free
- Source code
- github.com/fathomise/MailFathom
- Written in
- C#
- Requires
- Windows 11 / 10
- Architecture
- 64-bit, ARM64
- Installer
- Portable
- Version
- 0.4.0
- Released
- August 8, 2026
- Added to the catalogue
- September 1, 2026
- Versions listed
- 1
- GitHub stars
- 16
- Website
- github.com
- winget ID
- MailFathom.mfctl
Ratings and reviews
No reviews yet. Be the first to rate it.
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Frequently asked questions
Is MailFathom CLI free?
Yes. MailFathom CLI is open-source software under the Apache-2.0 licence.
Is MailFathom CLI 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 MailFathom CLI 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.
Does MailFathom CLI run on ARM (Windows on Arm)?
Yes, there is a native ARM64 installer.
Can I use MailFathom CLI without administrator rights?
Yes, it is portable: unpack and run it.
What are alternatives to MailFathom CLI?
Tuta Mail, Mailspring, Proton Mail Bridge, eM Client and MFCMapi. The alternatives page compares them.
