DMARC is an open email standard published in 2012 by the industry consortium DMARC.org to enable domain-level protection of the email channel. It works in conjunction with more well-known email standards SPF and DKIM, and is the only way for email senders to tell email receivers that emails they are sending are truly from them.
DMARC stands for Domain-based Message Authentication, Reporting & Conformance.
Domain Keys Identified Mail (DKIM) is a mechanism that allows verification of the source and contents of email messages. Using DKIM sending domains can include a cryptographic signature in outgoing email messages, thus vouching for its authenticity.
A message’s signature may be verified by all mail servers during transit and by the Mail User Agent upon delivery. DKIM indicates the message was sent by the legitimate sending domain, and the message was not altered during the transit.
Sender Policy Framework (SPF) is an email validation system designed to detect and block forged or spoofed emails. SPF allows an agency to specify which servers are allowed to send emails for their domain and makes this information available for recipients.
This process completed after verifying the sender's email server before delivering all legitimate emails to a recipient's inbox; hence, SPF allows only legitimate emails to the recipient's address, which excludes the fear of spam, virus, and phishing scheme emails.
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