DMARC is designed to support existing inbound email authentication processes of a domain. It works in conjunction with both Sender Policy Framework (SPF) and Domain Keys Identified Mail (DKIM). Domain administrators publish a policy that checks whether DKIM, SPF, or both are used for sending mail. It also handles failures when SPF and DKIM verification fails.
While DMARC does not directly check if an email is spam or fraudulent, it does require mail to pass both DKIM and SPF validation.
DMARC can provide powerful reporting capabilities with aggregate reports that capture statistical data, and forensic reports which include messages that failed SPF, DKIM or both.
Both DKIM and SPFs are used to limit email spoofing, such as sending emails from one 'from' address using a different 'from' address. E.g.
From Address: Joe@mybusiness.com
This will also affect you when sending an emailing through our system from a public domain, such as @gmail.com or @yahoo.com. You may experience a high number of bounces from email service providers due to this. We suggest sending emails straight from your company's domain to help reduce the bounce rate,