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Halon MTA screenshot 2017.png
Developer(s)Halon Security AB
Initial releaseApril 28, 2008; 12 years ago (2008-04-28)[1]
Stable release
5.2.1[2] / October 10, 2019 (2019-10-10)
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 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


  1. Tommy Engfors (2008-11-18). "Halon filtrerar skräppost virtuellt". Retrieved 2015-12-28. 
  2. 2.0 2.1 "Halon release notes". Halon Security AB. 
  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". 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 
  11. "Ren e-post med rätt tvätt". 2011. 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". 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. 

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