Xin. Command-line tool for reading and searching Fastmail email as plain text.

github.com/onevcat/xin

Problem

The full read on this project is a sign-in away — what it solves, who it serves, and where it sits in the market.

Audience

The full read on this project is a sign-in away — what it solves, who it serves, and where it sits in the market.

Market

The full read on this project is a sign-in away — what it solves, who it serves, and where it sits in the market.

Pricing

The full read on this project is a sign-in away — what it solves, who it serves, and where it sits in the market.

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Updates

February 2026

Release —xin v0.1.3 Feb 17
release: v0.1.3 Feb 17
chore(changelog): note Fastmail reply header fallback Feb 17
Merge pull request #10 from onevcat/fix/fastmail-reply-fallback-raw-h… Feb 17
fix(send): fallback to raw header text when Fastmail rejects asMessag… Feb 17
chore(release): create GitHub release page in release.sh Feb 16
Release —xin v0.1.2 Feb 16
release: make release.sh produce self-consistent tagged commits Feb 16
docs: regenerate xin skill docs for v0.1.2 Feb 16
Release v0.1.2 Feb 16
Merge pull request #9 from onevcat/fix/reply-jmap-messageids Feb 16
fix(reply): use JMAP parsed header forms for threading headers Feb 16
Release —xin 0.1.1 Feb 15
Release —xin 0.1.0 Feb 15
chore: prepare 0.1.1 release Feb 15
fix: use updated jmap-client with submission capability fix, revert d… Feb 15
fix: make submission methods work on Fastmail (Identity/get + EmailSu… Feb 15
ci: ensure generated skill docs are up to date Feb 15
docs: agent-first README + query help + regen skill refs Feb 15
docs: make JSON-first agent workflow the default Feb 15
docs: make config init optional in README Feb 15
docs: add Homebrew install to README Feb 15
chore: release script uses plain semver tags Feb 15
chore: add license/changelog and Homebrew tap release workflow Feb 15