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Email Foundations

Email as a Distributed System
Actors, Protocols, and Standards
Hosts and Hostnames
IP Addresses and Addressing
Email Fundamentals

Authentication

Authentication

DNS

DNS

Reputation

Reputation

Warmup

Warmup

Deliverability

Deliverability

Inbox Placement

Inbox Placement
- Primary Inbox
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- Junk Folder

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Infrastructure

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DNS
A records

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Authentication
DNS
Reputation
Warmup
Deliverability
Inbox Placement

A records

IPv4 address records used by hosts and often by mail server names.

Reading time:: 5 min
Difficulty:: Beginner
Estimated duration:: 5 min
Prerequisites:: DNS
Last updated:: 2026-07-15
Author:: empire

Definition

A records bind a domain name to an IPv4 address.

Prerequisites

DNSDomain Name System — the lookup fabric email authentication depends on.

DNSDomain Name System — the lookup fabric email authentication depends on.

PreviousMX records NextAAAA records

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