Email authentication methods is a antispam and anti forging technique that verifies the source of any message received by a recipient, The results of such validation is used in delivery decisions by ISPs. Any sender attempting to forge another users domain address in an email campaign will most likely get blocked. Authentication methods:
- DKIM (DomainKeys Identified Mail) The successor to Yahoo’s DomainKeys, DKIM associates an email message to a senders domain by adding a multiple signature’s to a message's content - called “keys” which are made public in the DNS records of a sender's domain, used by email providers to verify the authenticity of outgoing mail.
- DK (DomainKeys) Similar to DKIM, DK allows the sender to publish unique digital code to the email headers - combination of public and private “keys” to authenticate outgoing emails against the senders domain.
- SPF (Sender Policy Framework) SPF is a record of sending addresses that are allowed to send email on behalf of your domain. Recipients or email providers can refer to this record to determine whether a message claiming to be from your domain comes from an authorized sender.
- SenderID Similar to SPF, except that it extends the verification process to include Purported Responsible Address (PRA) domain using the “From” address or Sender header fields.
- DMARC (Domain-based Message Authentication, Reporting and Conformance)