Glossary
The terms, in plain English.
Definitions of the email infrastructure and hosting concepts we use across the guides — written to be understood, not to sound clever.
- IP Warming Gradually building a sending IP's reputation by ramping volume over weeks so mailbox providers learn to trust it.
- rDNS / PTR Record The reverse-DNS record that maps a sending IP back to a hostname — a baseline requirement for inbox placement.
More terms are added as the guides grow. Looking for something specific? Ask us or browse the guides.