Glossary
Glossary1 min read
DNS Records for Email
DNS records (MX, PTR, SPF, DKIM, DMARC) are where every deliverability check begins. A definition, with the full reference linked.
RT
RepMail Team
Product & Engineering · July 17, 2026 · 1 min read
DNS records are the entries in your domain's Domain Name System that mail servers query before trusting or delivering your email. MX routes inbound mail, PTR maps your sending IP to a hostname, and SPF, DKIM, and DMARC authenticate outbound mail.
Changes usually propagate within minutes but can take up to 24 to 48 hours.
See the full guide: Full guide: DNS records for email.
Resources in this guide
Email DNS records
Reference| Record | Role |
|---|---|
| MX | Route inbound mail |
| PTR | Map sending IP to hostname |
| SPF/DKIM/DMARC | Authenticate outbound mail |
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Frequently asked questions
Which DNS records matter for sending?
SPF, DKIM, and DMARC authenticate your outbound mail, and PTR (reverse DNS) maps your sending IP to a hostname. MX matters for receiving replies.
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