Editing Sender Policy Framework (section)

=== DNS SPF Records ===
To enable rapid testing and deployment, initial versions of SPF checked for its setting in the DNS TXT record of the sending domain - even though this record was traditionally supposed to be free-form text with no semantics attached.<ref name="Bellovin">[http://www.interesting-people.org/archives/interesting-people/200401/msg00037.html Steve Bellovin expresses doubts] {{webarchive|url=https://web.archive.org/web/20040413235149/http://www.interesting-people.org/archives/interesting-people/200401/msg00037.html |date=2004-04-13 }} (Jan 2004)</ref> Although in July 2005, [[Internet Assigned Numbers Authority|IANA]] assigned a specific Resource Record type 99 to SPF the uptake of was never high, and having two mechanisms was confusing for users. In 2014 the use of this record was discontinued after the SPFbis working group concluded that ''" ...significant migration to the SPF RR type in the foreseeable future was very unlikely and that the best solution for resolving this interoperability issue was to drop support for the SPF RR type."''<ref name="rfc7208-txt" />