Loading Empire…

Skip to content

Learn Fix Tools

Search/

Appearance

Filter topics…

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
- Promotions and Tabs
- Junk Folder

Infrastructure

Infrastructure

Home
Learn
Reputation
Bounce rate

Learning path

Authentication
DNS
Reputation
Warmup
Deliverability
Inbox Placement

Bounce rate

Share of attempted deliveries that fail permanently or repeatedly, harming sender trust.

Reading time:: 5 min
Difficulty:: Beginner
Estimated duration:: 5 min
Prerequisites:: None
Last updated:: 2026-07-15
Author:: empire

Definition

High permanent-failure volume signals poor list quality and is used by receivers when scoring senders.

ReputationHow mailbox providers judge senders from IP, domain, and behavioral signals over time.

PreviousComplaint rate NextSpam traps

Company

About
Contact
Services

Platform

Learn
Fix
Tools

Community

Empire is a living operator community — share practice, follow releases, and help shape the knowledge base.

Newsletter — coming soon

Legal

Privacy Policy
Terms of Use
Disclaimer
Editorial Policy
Cookie Policy

© 2026 Empire Email

Independent educational platform focused on email infrastructure, deliverability, and lifecycle marketing.