https://skysigal.com/ 2026-05-01T19:24:17+00:00 https://skysigal.com/ https://skysigal.com/lib/tpl/bootstrap3/images/favicon.ico text/html 2024-06-19T20:37:28+00:00 Anonymous (anonymous@undisclosed.example.com) https://skysigal.com/it/ad/spf/home?rev=1718829448&do=diff IT:AD:SPF * (UP) spf index * See also: * IT:AD:Email * IT:AD:SMTP * IT:AD:DKIM * <https://github.com/nicanorflavier/spf-dkim-dmarc-simplified> Sender Policy Framework (SPF) is an email validation system designed to prevent email spam by detecting email spoofing, a common vulnerability, by verifying sender IP addresses. Resources * <http://en.wikipedia.org/wiki/Sender_Policy_Framework> * <http://www.openspf.org/Tools>