Rspamd 4.0 has been released with major new features including external pre-trained neural/LLM embedding support, /checkv3 multi-part protocol support, a pluggable async Hyperscan cache, multi-flag fuzzy hashes, HTML fuzzy phishing detection, HTTPS server support for workers, and a new built-in fast text shim offering 500MB to 7GB in memory savings. The release also improves the GPT module, adds ASCII85 decode support, HTTP content negotiation, Reply-To validity checks, Zstd compression for the structured metadata exporter, and token bucket load balancing.
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