DKIM
TL;DR: Imagine sending a letter through the mail. You want to make sure that the letter is really from you and hasn't been tampered with. DKIM (DomainKeys Identified Mail) is...
DMARC
TL;DR: Imagine you run a business and want to ensure that all the letters you send are trusted and not tampered with. DMARC (Domain-based Message Authentication, Reporting, and...