Overview of this blog Here are some basic ideas we wish to cover. SPF allows senders to define which IP addresses are allowed to send mail for a particular domain. DKIM provides an encryption key and digital signature that verifies that an email message was not faked or altered. DMARC unifies the SPF and DKIM authentication mechanisms into a common framework and allows domain owners to declare how they would like email from that domain to be handled if it fails an authorization test.
Continue reading