Editing Anti-spam techniques (section)

===Authentication===
{{Further|Email authentication|Sender Policy Framework|DKIM|DMARC}}

A number of systems have been developed that allow domain name owners to identify email as authorized. Many of these systems use the DNS to list sites authorized to send email on their behalf. After many other proposals, [[Sender Policy Framework|SPF]], [[DKIM]] and [[DMARC]] are all now widely supported with growing adoption.<ref>Butcher, Mike. [https://techcrunch.com/2012/01/30/dmarc-promises-a-world-of-less-phishing/ DMARC Promises A World Of Less Phishing] {{webarchive|url=http://archive.wikiwix.com/cache/20170626045125/https://techcrunch.com/2012/01/30/dmarc-promises-a-world-of-less-phishing/ |date=2017-06-26 }}. Tech Crunch. Jan 30, 2012</ref><ref>{{cite news |last1=Kerner |first1=Sean Michael |title=DMARC Email Security Adoption Grows in U.S. Government |url=http://www.eweek.com/security/dmarc-email-security-adoption-grows-in-u.s.-government |access-date=20 December 2018 |work=e-Week |date=2 January 2018}}</ref><ref>{{cite news |last1=Stilgherrian |title=Australian government lags UK in deploying DMARC email spoofing prevention |url=https://www.zdnet.com/article/australian-government-lags-uk-in-deploying-dmarc-email-spoofing-prevention/ |access-date=20 December 2018 |date=18 December 2018}}</ref> While not directly attacking spam, these systems make it much harder to [[Email spoofing|spoof addresses]], a common technique of spammers - but also used in [[phishing]], and other types of fraud via email.