Halon Security is a privately held company that's headquartered in Gothenburg, Sweden. The company develops a scriptable SMTP server, and specialises in email delivery and anti-spam for hosting providers.
In 2004, Halon's first product based on OpenBSD was released by Skal Soft, a sub-diary of Skal Consulting Group AB. In early 2007, Halon Security was established as a sub-diary of Skal Consulting Group AB. In 2010, Halon Security AB was formed as an independent entity in Sweden, and in 2013 Halon Security Inc. based in California was established.