Anonymous (not verified) - Mon, 2006-07-03 20:49
SPF - Sender Policy Framework
What is it?
Sender Policy Framework. Anti-spam technique based on verifying the source of an email.
How does it work?
You create a list of all the mail servers that are allowed to send mail for your domain, and add it as a dns txt record. For example:
gmx.net. 300 IN TXT "v=spf1 ip4:18.104.22.168/23 -all"