Changelog

2.2.1

Released 2026-03-25

  • Bug Fix handling of very long bounce messages

2.2.0

Released 2026-03-05

  • New Added an MTA backoff classification model that classifies bounce messages into specific backoff reason categories (for example temporary system failures, rate limits, reputation or policy-related blocks, and recipient errors).

2.1.1

Released 2025-09-19

  • Bug Fix required dependencies list

2.1.0

Released 2025-09-18

  • Imp Improved normalisation

  • Imp Improved classification by retraining the model with more recent information

  • Imp Performance improvements

2.0.0

Released 2025-07-25

  • Imp Rewritten in Rust instead of Python

Warning

The path of the binary has changed to /opt/halon/bounce-classifier/sbin/bounce-classifier.

Warning

The default path where the cache is stored has changed to /var/lib/halon/bounce-classifier.

1.3.0

Released 2025-03-26

  • New Added category PROTOCOL_ERROR

  • Imp Better support for German and French smtp error messages

  • Imp Improved model accuracy

1.2.0

Released 2025-02-26

  • New New /v2 API endpoints with probability score reporting

  • Imp Server-side batching API endpoint renamed from /bnac/batch to /bnac/single (Old one kept as alias)

  • Bug Fixed bug where /cache/stats API endpoint reported that stats were enabled when they weren’t

1.1.1

Released 2025-02-14

  • New Added coverage of bounce messages

  • Imp Improved accuracy of model

1.1.0

Released 2025-01-07

  • New Support for request cache in /bnac endpoint

  • New New /bnac/batch endpoint for server side request batching

1.0.0

Released 2024-12-16

  • New Initial release