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Email Foundations

Email as a Distributed System
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Reputation
IP reputation

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Authentication
DNS
Reputation
Warmup
Deliverability
Inbox Placement

IP reputation

Provider trust in a sending IP address based on historical traffic quality and outcomes.

Reading time:: 5 min
Difficulty:: Intermediate
Estimated duration:: 5 min
Prerequisites:: PTR records
Last updated:: 2026-07-15
Author:: empire

Definition

IP reputation reflects how receivers evaluate traffic from a specific sending address over time.

Prerequisites

PTR recordsPointer records used for reverse DNS lookups of IP addresses.

ReputationHow mailbox providers judge senders from IP, domain, and behavioral signals over time.
PTR recordsPointer records used for reverse DNS lookups of IP addresses.
Domain reputationProvider trust in a sending domain identity, often stronger than IP reputation alone.

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