Halon (software)

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Halon MTA screenshot 2017.png
Developer(s)Halon Security AB
Initial releaseApril 28, 2008; 13 years ago (2008-04-28)[1]
Stable release
5.4.2[2] / October 1, 2020 (2020-10-01)
Written inC++[3]
Operating systemUnix-like
TypeMail transfer agent
LicenseProprietary commercial software

Halon is a commercial scriptable[4] SMTP server. It's available for Linux as well as a software distribution based on FreeBSD.[2]

The web hosting provider One.com uses Halon[5] which operates some of the most active (on the basis of the number of domains they support) mail servers.[6]

Like Postfix it supports DANE,[7][8] as well as the draft for MTA-STS,[9][10] for encrypted email transfer. It provides other email security features such as spam filtering[11][12] from CYREN,[13] DMARC[14][15][16] and DKIM.[17] Like MailChannels, it supports transparent[18] operation in order to filter spam coming out of servers not administered by the provider.

See also[edit]


  1. ^ Tommy Engfors (2008-11-18). "Halon filtrerar skräppost virtuellt". IDG Techworld. Retrieved 2015-12-28.
  2. ^ a b "Halon release notes". Halon Security AB. Retrieved 2020-10-01.
  3. ^ "Netnod autumn meeting 2016". Netnod Internet Exchange i Sverige AB. Retrieved 2017-08-09.
  4. ^ Martijn Grooten (2012-03-16). "Comparative review". Virus Bulletin Ltd. Retrieved 2012-12-29.
  5. ^ "Company Overview". Bloomberg L.P. Retrieved 2015-12-28.
  6. ^ "100 Most Popular Mailservers". DomainTools. Retrieved 2015-12-28.
  7. ^ Jakob Schlyter; Kirei AB. "DANE" (PDF). RTR-GmbH. Retrieved 2015-12-17.
  8. ^ "Halon DANE support". Halon Security AB. Retrieved 2015-12-17.
  9. ^ Margolis, D.; Risher, M.; Ramakrishnan, B.; Brotman, A.; Jones, J. (January 2018). SMTP MTA Strict Transport Security (MTA-STS). IETF. I-D draft-ietf-uta-mta-sts-07. Retrieved August 9, 2017.
  10. ^ https://github.com/halon/hsl-examples/tree/master/protocols/mta-sts
  11. ^ Mikael Simovits; Tomas Forsberg (2011). "Ren e-post med rätt tvätt" (PDF). IDG Techworld. Retrieved 2015-12-28.
  12. ^ "VBSpam Results Overview". Virus Bulletin Ltd. Retrieved 2015-12-28.
  13. ^ "Customers and partners". CYREN. Retrieved 2015-12-28.
  14. ^ "Products and Services". DMARC.org. Retrieved 2015-12-28.
  15. ^ Kent Olofsson (2013-11-21). "Så tycker experterna om dmarc". IDG Techworld. Retrieved 2015-12-28.
  16. ^ Martijn Grooten. "VBSpam comparative review January 2014". Virus Bulletin Ltd. Retrieved 2015-12-28.
  17. ^ https://github.com/halonsecurity/libdkimpp
  18. ^ https://github.com/halonsecurity/proxsmtp