DMARC’s alignment feature prevents spoofing of the “header from” address by: Matching the “header from” domain name with the “envelope from” domain name used during an SPF check, and Matching
Why DMARC is important?
With the rise of the social internet and the ubiquity of e-commerce, spammers and phishers have a tremendous financial incentive to compromise user accounts, enabling theft of passwords, bank accounts,