Email Authentication Essentials
Everything that proves your mail is really yours: the authentication overview, each of SPF, DKIM, and DMARC in depth, and the DNS records they live in.
6 guides
The Complete Guide to Email Authentication
How SPF, DKIM, DMARC, and the newer ARC and BIMI standards prove your mail is really yours, and why cold email fails without them.
What Is an SPF Record, and How Do You Set It Up?
SPF is a DNS record listing the servers allowed to send as your domain. Here is how it works, how to set it, and the mistakes that break it.
What Is DKIM, and Why Does It Matter for Cold Email?
DKIM cryptographically signs every message you send so receivers can prove it is really from you and was not altered. Here is how to set it up.
What Is DMARC, and Which Policy Should You Use?
DMARC tells receivers what to do when SPF or DKIM fails, and reports who sends mail in your name. Here is how to roll it out without blocking yourself.
DNS Records for Email: MX, PTR, SPF, DKIM, and DMARC
Every deliverability check starts in your DNS. Here is what each email record does, MX, PTR, SPF, DKIM, DMARC, and how they work together.
Google and Yahoo Sender Requirements, Explained
Google and Yahoo now enforce authentication, one-click unsubscribe, and a hard spam-complaint ceiling. Here is exactly what each rule asks of you.