flufl.bounce
Email bounce detectors
Decision gist · record as of 2026-08-14
Yes. The package is mature (Production/Stable, Mature classifiers), actively maintained, has no known vulnerabilities, and solves a specific problem in email handling with low install friction. It is well-suited for any project that needs to reliably parse bounce messages.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires Python 3.10 or later.
- Low install friction with a single pure-Python dependency (atpublic).
- Active maintenance status with a recent release (84 days ago).
License · maintenance · safety
Apache-2.0 (permissive) — Licensed under Apache-2.0 (permissive), allowing commercial and private use with minimal restrictions.
last release 2026-05-22 (84 days)
0 known vulnerabilities (OSV.dev, 2026-08-14) · 681,187 downloads/mo, #5,364 on PyPI
Alternatives
Verify before relying
pip install flufl.bounce
from flufl.bounce import bounce_scanner
addresses = bounce_scanner(bounce_message_text)- Specific accuracy or coverage metrics for the bounce detection heuristics across different mail systems
- Performance characteristics when processing large volumes of bounce messages
What it is and what it does
flufl.bounce is a Python library for parsing bounce messages and extracting the original email addresses that triggered delivery failures. It implements heuristics to handle the many different bounce message formats found in real-world mail systems, and provides explicit support for VERP (Variable Envelope Return Path) and RFC 3464 DSN (Delivery Status Notification) formats.
The library is designed for developers building mail handling systems—particularly mailing list managers and email processing pipelines—where identifying which addresses bounced is essential for list maintenance and delivery monitoring. It requires Python 3.10 or later and depends only on atpublic, making it straightforward to integrate into existing projects.
Use it for
- Mailing list management: automatically process bounce messages to identify and remove non-deliverable addresses
- Email delivery monitoring: extract bounced addresses from DSN notifications to track delivery failures
- VERP-based bounce tracking: parse variable envelope return path messages to correlate bounces with original recipients
- Bulk email systems: filter and categorize bounce messages to separate permanent failures from temporary issues
- Mail server integration: build bounce handlers that extract addresses for automated list cleaning
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes.
The package is mature (Production/Stable, Mature classifiers), actively maintained, has no known vulnerabilities, and solves a specific problem in email handling with low install friction. It is well-suited for any project that needs to reliably parse bounce messages.
Install
flufl-bounce on PyPI
Before you install
Low install friction with a single pure-Python dependency (atpublic). Active maintenance status with a recent release (84 days ago).
Requires Python 3.10 or later.
License in practice
Licensed under Apache-2.0 (permissive), allowing commercial and private use with minimal restrictions.
Quickstart
pip install flufl.bounce
from flufl.bounce import bounce_scanner
addresses = bounce_scanner(bounce_message_text)Verify before relying
- Specific accuracy or coverage metrics for the bounce detection heuristics across different mail systems
- Performance characteristics when processing large volumes of bounce messages
Package facts
| License | Apache-2.0 permissive |
| Python support | Supports the current Python release >=3.10 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | 1 packageatpublic |
| Maintenance | Actively maintained 84 days since the last release |
| First released | |
| Downloads | 681,187 / month, #5,364 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Development Status :: 5 - Production/StableDevelopment Status :: 6 - MatureIntended Audience :: DevelopersLicense :: OSI Approved :: Apache Software LicenseOperating System :: MacOS :: MacOS XOperating System :: Microsoft :: WindowsOperating System :: POSIXProgramming Language :: PythonProgramming Language :: Python :: 3Topic :: Communications :: EmailTopic :: Software Development :: LibrariesTopic :: Software Development :: Libraries :: Python Modules |
Evidence: flufl_bounce-5.0.1-py3-none-any.whl
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See also email-validator · postmarker · django-ses · flufl.lock · flufl.i18n · mailbits · emval · pyIsEmail · mail-parser · zerobouncesdk