| Acronym | Expanded Form | Notes |
| SPF | Sender Policy Framework | Authenticates at the DNS level for a domain |
| DKIM | DomainKeys Identified Mail | Adds signature to mail headers to prove it came from your server |
| DMARC | Domain-based Message Authentication, Reporting and Conformance | Piggybacks on SPF and DKIM; specifies rejection policy and error reporting addresses |
| MX | Mail Exchange record | Where the mail server is for the domain in question |
| PTR | Pointer | Used for reverse DNS; points an IP to a domain |
| SMTP | Simple Mail Transfer Protocol | |
| FCrDNS | Forward-confirmed reverse DNS | A check that the PTR and A record create a circle, proving complete ownership |
| DNS | Domain Name System | |
| CNAME | Canonical Name Record | An alias of another record |