cmsend: chatmail sendmail tool for end-to-end encrypted messages

WORK IN PROGRESS: this is more an explorative study for now

To install use:

uv tool install cmsend

To send and receive from a single chatmail relay:

cmsend --init nine.testrun.org   # <-- substitute with the domain you want to set as origin

To setup a tagged chat using an invite link:

cmsend -t LOG --join "INVITELINK"       # <-- quotes are neccessary because links contain "&"

To send a message to a tagged chat:

echo "hello" | cmsend -t LOG

To list all chats with tags:

cmsend -l

To send a message to a tagged chat with an attachment:

cmsend -t LOG -m "here is the file" -a README.md

To show help:

cmsend -h

Developing / Releasing cmsend

clone the git repository at https://github.com/chatmail/cmsend
install 'cmsend' in editing mode: uv pip install -e .
edit cmsend.py and test, finally commit your changes

chatmail/workflows defines py-checks for this repository. Run checks locally with uvx ruff check . and uvx ruff format --check .

To release, run the shared release script from a checkout of chatmail/workflows:

python ../workflows/scripts/make_new_release.py

It runs the checks, tests the built wheel, generates the CHANGELOG.md entry with git-cliff and opens it in your editor, then commits, tags vX.Y.Z and pushes. The release.yml workflow builds and publishes to PyPI via trusted publishing (OIDC); no local twine or PyPI token is involved.

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Provenance

The following attestation bundles were made for cmsend-0.5.0.tar.gz:

Publisher: release.yml on chatmail/cmsend

Attestations: Values shown here reflect the state when the release was signed and may no longer be current.

Statement:
- Statement type: https://in-toto.io/Statement/v1
- Predicate type: https://docs.pypi.org/attestations/publish/v1
- Subject name: cmsend-0.5.0.tar.gz
- Subject digest: 55f0c3318621af1003ffcfc93f38138cecdec2d958edb6d753f670be505f9fe9
- Sigstore transparency entry: 2274244752
- Sigstore integration time: Jul 28, 2026
Source repository:
- Permalink: chatmail/cmsend@a3927f2b560c2d5b7851ef71732a19869f24f1ec
- Branch / Tag: refs/tags/v0.5.0
- Owner: https://github.com/chatmail
- Access: public
Publication detail:
- Token Issuer: https://token.actions.githubusercontent.com
- Runner Environment: github-hosted
- Publication workflow: release.yml@a3927f2b560c2d5b7851ef71732a19869f24f1ec
- Trigger Event: push