CNAME records
DNS aliases often used for DKIM selectors and vendor CNAMEs.
- Reading time:
- 5 min
- Difficulty:
- Intermediate
- Estimated duration:
- 5 min
- Prerequisites:
- None
- Last updated:
- 2026-07-15
- Author:
- empire
Definition
DNS aliases often used for DKIM selectors and vendor CNAMEs.
How it works
A CNAME aliases one name to another. Email platforms often ask for CNAMEs for tracking or DKIM selector hosts, but a CNAME at the zone apex is invalid and breaks other record types.