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At its core, Halon is a scriptable SMTP server

Halon is a scriptable email gateway and anti-spam filter (MTA or proxy) with many features and an extensive ecosystem; probably best described as an email delivery and security platform. It is used primarily by web hosting providers, and powers some of the world's most popular mail servers.

Getting started

The software can be downloaded for free and installed on any x86-64 server/computer or as a virtual machine. Supplementary software is available on our GitHub page.

• Getting started guide
  • Writing system images for bare-metal or live-CD install methods
  • Using a hypervisor template for VMware, KVM, Hyper-V or Citrix XenServer
  • Running on cloud services such as Amazon EC2, Azure, GCE, Rackspace, CenturyLink or GleSYS
• User's FAQ and pricing

Documentation

Halon consolidates all the functionality needed in front of email servers

This informational website is arranged as a wiki. Below are a list of the most requested articles for your convenience.

SMTP and e-mail

• Email security
  • Anti-spam by Cyren and an optimised SpamAssassin
  • Outbound spam filtering and delivery
  • DKIM signing and verification with DMARC
  • Encryption with DANE
  • SPF handling and SRS
  • Bounce verification with BATV
  • Content filtering, also called DLP
  • Rate limiting
• Delivery and routing
  • Scripted routing
    • External API calls
    • Routing by DNS appending
  • Handoff with LMTP
  • Recipient filtering and in-line delivery
  • Proxy mode and fully transparent outbound anti-spam
    • HAProxy and XCLIENT support
• E-mail tracking search filters and logging

Programming and integration

• HSL scripting and API calls
• Fetching statistics using SNMP
• Platform integration with cPanel, WHMCS, Odin and Atomia.
• SOAP API

System and management

• Software update
• Performance benchmarks and considerations
• Clustering for scalability
• System architecture and disk layout
• IPv6 support
• Management
  • End-user installation guide
  • Custom reporting and statistics
  • Defining LDAP sources
  • Installing PKI certificates
  • The revision-managed configuration
  • Performing recovery if something goes wrong
  • Local users and console administration
  • API authentication
• Storage
  • Disk layout
  • Quarantine folders
  • Archiving