What is SPF?
SPF (Sender Policy Framework) – An incoming mail servers security protection protocol, IT blocks e-mail receival from unauthorized sources. SPF was created to limit the number of SPAM e-mails.
How does SPF work?
SPF protected server checks in DNS system whether a message was send from a server authorized to send out messages from a given domain. When it is authorized the mail is accepted. However when an IP address or domain address of a send out server is not authorized to send e-mails from a given domain, e-mail is not accepted. Thanks to this messages sent by spammers spoofing someone else’s address or by Mydoom type viruses will be rejected.