Vendors

High-performance open-source spam filtering with Bayesian learning, fuzzy hashing, and neural network support. Compare Rspamd with other email security tools.

Open-source anti-spam platform providing email filtering using heuristic analysis, Bayesian filtering, and DNS blocklists

Open-source email archiving with full-text search, retention policies, and audit-ready compliance tools. Compare Piler for MSP email management.

Open source email security system for Linux-based email gateways protecting against viruses, spam, phishing, and malware

Open-source email filtering framework that works with Sendmail's Milter API to provide customizable mail filtering in Perl.

High-performance interface between mailer (MTA) and content checkers like spam and antivirus scanners

Comprehensive email security solution protecting against spam, malware, and advanced threats with AI-powered detection.

Cloud-based email security for SMBs with advanced threat protection, URL defense, and email continuity. Review Proofpoint Essentials for MSP clients.

Cloud-based advanced email security platform protecting against sophisticated email attacks, malware, and data loss.

Open-source email gateway with spam filtering, virus scanning, and policy-based routing to protect mail infrastructure. Review Proxmox Mail Gateway.