SPAMfighter Mail Gateway

SPAMfighter Mail Gateway integrates perfectly with the company’s existing e-mail infrastructure to secure the company e-mail environment. It is easy to install and use with no daily maintenance tasks needed. SPAMfighter Mail Gateway is based on SPAMfighter’s unique world-wide community with over 8 million users.

Using the same layered architecture as SPAMfighter Exchange Module, this solution differs by being capable of working together with any SMTP mail server on the market.

A design criteria used throughout the application is an emphasis on performance. Competing products with similar capabilities is often satisfied with being able to handle 1000 e-mails per minute on stock hardware – SPAMfighter Mail Gateway excels by being clocked at 3500+ e-mails per minute.


Senior lead .NET/C# system developer on the commercially available product "SPAMfighter Mail Gateway" – a high performance antispam and anti-malware solution.

It was my role to design and develop the system – and continually develop new features for the products and maintaining existing features. The system required high level of integration to external systems and required knowledge of a wide range of technologies and standards. The requirement for the system was that it needed to be high performance, advanced and feature leading in its product categories.

Featuring approximately 150.000 lines of code spanning 90+ projects in Visual Studio, the system was developed using .NET/C#, ASP.NET, Web Services, COM technologies, JavaScript, JQuery and used multithreading and concurrency.

My responsibilities were:

  • Design standard compliant SMTP gateway.
  • Integration with Active Directory.
  • Support multiple database engines.
  • Design and develop plugins
  • Develop parsers that could process e-mails, DNS records and other types of structured data.
  • Design and develop advanced and high performance algorithms.
  • Performance optimization.
  • Develop multi-threaded and high concurrency processing engines.
  • Develop product installers.
  • Design and develop ASP.NET administration interface and dashboard.
  • Design and develop custom HTTP and SMTP servers.


My roles in the project were:

  • System Development
  • System Design
  • Web development


Technologies used in project were:

  • .NET
  • C#
  • Web Services
  • SOAP
  • Windows Service
  • SQLite
  • Microsoft SQL server
  • XML
  • Microsoft Server
  • Active Directory
  • COM Server
  • SMTP
  • LINQ
  • HTTP
  • Multithreading
  • Concurrency
  • Regular Expressions
  • Cryptography
  • Installers