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The Lupaxa SRE Toolbox
Part of The Lupaxa Project


lupaxa-smtp-tester

Send a test email through an SMTP server to verify delivery.

Features

  • Open one SMTP session and send a short plain-text test message
  • Add Date and Message-ID headers automatically
  • Require STARTTLS before AUTH or DATA (fail if it is not advertised)
  • --tls for implicit TLS (SMTP_SSL, typically port 465)
  • --no-starttls to send without the upgrade (plaintext AUTH if used)
  • Optional AUTH: username and password together, or omit both
  • Credentials from flags or SMTP_USERNAME / SMTP_PASSWORD
  • --timeout to bound the socket
  • --verbose logs steps without protocol payloads or the password
  • Library API (send_test_message, SmtpTestResult with smtp_code)
  • Fully typed, linted, formatted, and tested
  • No runtime dependencies beyond the standard library

Installation

From PyPI

pip install lupaxa-smtp-tester

From source (development mode)

pip install -e ".[dev]"

Requires Python 3.13+. No runtime dependencies.

Library quick start

from lupaxa.smtp_tester import send_test_message

result = send_test_message(
    "smtp.example.com",
    587,
    "USER",
    "PASS",
    "from@example.com",
    "to@example.com",
)
print(result.ok, result.detail, result.smtp_code)

CLI quick start

smtp-tester --help
smtp-tester --from-address from@example.com --to-address to@example.com \
  --smtp-username USER --smtp-password PASS \
  --smtp-server smtp.example.com --smtp-port 587
smtp-tester -f from@example.com -t to@example.com \
  -s smtp.internal.example.com --no-starttls
smtp-tester -f from@example.com -t to@example.com -u USER \
  -s smtp.example.com --tls -P 465

You can also run the CLI as a module:

python -m lupaxa.smtp_tester --help
python -m lupaxa.smtp_tester --version

Documentation

Online documentation:

Documentation

Source repository:

GitHub

Serve docs locally

From a clone of the repository:

make mkdocs-serve

Then open the local URL printed by MkDocs in your browser.

Development

Clone the repository and install with Make:

make init                # first-time makefile-skills checkout
make python-install-dev  # editable install with [dev]
make python-check        # lint, type-check, and test
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Data verified by PyPI on Sep 10, 2026
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Credits

Author: The Lupaxa Project

GitHub Statistics

Data verified by PyPI on Sep 10, 2026
The GitHub source repository was provided by the project maintainers and verified by PyPI at the time of upload. Stars, forks, and open issues/PRs are derived from that repository and have not been independently verified.

License

MIT License (MIT License)

Requires

Python >=3.13

Provides Extra

dev test

Tags

cli email ses smtp sre

Classifiers

Report project as malware

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