Products & Service

Mail Transfer Agent for large-scale mail delivery

Flexible and secure email MTA software that can cover a wide range of situations from largest service providers to small enterprises.

Halon, a messaging security company, is headquartered in Gothenburg Sweden. They have a 90% market share in their home country and have also deployed in many large-scale xSP throughout the EU. There are a number of unique characteristics to their solution, in particular you can deploy and integrate a new large-scale mail delivery platform alongside of existing systems and realize a level of flexibility that tailors to your environment and requirements.

overview HALON
overview HALON

Service Features

High performance and fully featured

  • Fast delivery performance
  • Supports SMTP UTF8 to XCLIENT and Proxying
  • Workflow script that can be called at each step of the SMTP process such as Connect, Auth, MAIL, RCPT, DATA
  • Before and after the SMTP / LMTP session, workflow scripts can be called post delivery

Flow limitation

  • Rate limits for unsolicited/spam messages, control unauthorized use, brute force countermeasures, etc.
  • Sending and receiving on a per destination domain and or source IP supported
  • Advanced control with sliding window
  • Fast synchronization between clusters

Outbound spam protection

  • Multiple source IP classes can be used. Different policies can be applied to each class
  • Limit control for each destination, SPAM transmission countermeasures, delivery error handling, queue handling for each domain and user
  • Assisting in the prevention of external blacklisting

Supports sender domain authentication

  • Supports SPF, DKIM, DMARC and ARC
  • Easy to install

Script-based workflow

  • Multiple source IP classes can be used and different policies can be applied to each class
  • Limit control for each destination, SPAM transmission countermeasures, delivery error handling, queue handling for each domain and user
  • Flexible operation is possible according to the operation policy, latest standard, and threat trends
  • Dedicated script debugging tool available
  • Reduces implementation cost
  • Provided with multiple sample scripts

Easy and verifiable deployments

  • Multiple versions can be run in parallel and new workflow can be applied without affecting existing messages during the delivery process.
  • Easy rollback when issues occur
  • Visualize changes with revision control

Other functions and features

Highly accurate anti-spam and anti-virus
  • SPAM / Virus filter by Cyren and Sophos
  • Compatible with filters made by other companies
  • High accuracy managed by intelligent workflow
Support for encryption standards
  • MTA-STS、TLS-RPT、DANE
  • Client certificate for server and client
  • More detailed TLS protocol
  • Cryptographic control
  • SNI(Server Name Indication)
Milter compatible
  • Allows use of third-party Milter applications, including TwoFive's developed solutions
Powerful reporting and logging
  • Script-controllable custom reports
  • Supports external linkage such as HTTP / JSON, SQL, Elasticsearch
Flexible queue management
  • Can hold and manage multiple queues by destination domain or other policy definition
  • Retry policy and number of sessions can be set and managed individually for each queue
Large scale support
  • Masterless cluster with no single point of failure
  • Centralized management by pushing settings and workflow changes
  • All servers can play the same role and is easy to expand
  • Partially separate cluster is possible according to the configuration