Halon SMTP software features

Halon is a scriptable SMTP software for email infrastructure and security, designed for service providers. Features include anti-spam, verification, signing, encryption and much more.
Halon already power some of the worlds most popular email servers.


  • Fully Scriptable
  • Great Scalability
  • Multiple Rate Limiting
  • Top-notch Anti-Spam
  • Future-proof
  • Total Control
  • World Class Support

Try the demo to see the features >

Suitable for

  • Hosting Provider
  • Service Provider
  • Telco / ISP
  • Enterprise


Bare metal: video, serial
Virtualization: VMware, Hyper-V, universal
Cloud providers: EC2, GCE, Azure, Rackspace
Version: Halon 3.5-r5p5 change log
Kernel: FreeBSD 10.3
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