SpamAssassin Review 2026
The #1 Enterprise Open-Source Spam Filter
What is SpamAssassin?
Apache SpamAssassin is the #1 open-source anti-spam platform that gives system administrators a filter to classify email and block spam. It uses a scoring framework with heuristic and statistical analysis tests.
Best for
Mixed
Use cases
- spam classification
- email filtering
Key features
scoring framework
Bayesian filtering
DNS blocklists
collaborative filtering
plugin support
Pricing
Model
free
Price range
Open-source project of the Apache Software Foundation
Free tier
Yes
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