Definition
Email IP reputation is the evaluation mailbox providers assign to your sending IP address, influencing where your mail lands in the inbox. A good reputation earns inbox placement; a poor one increases filtering and spam placement.
Reputation is built from consistent sending identity, historical behavior, list health (low bounces, complaints, spam traps) and engagement signals. It develops over time and can be damaged quickly by poor practices.
To protect it, send consistently using a stable, authenticated identity, keep lists clean and permission-based, watch complaint and bounce rates, and monitor reputation through feedback and Postmaster-type tools. Dedicated and shared IPs carry different reputation dynamics.
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Related Glossary Terms
Abuse Complaint
An abuse complaint is a report from a recipient who marks an email as spam, which negatively affects sender reputation and deliverability.
AI Content Detection
AI content detection refers to the growing ability of email clients, spam filters and consumers to identify machine-generated email copy. It matters for deliverability, trust and engagement in an era of mass-produced AI marketing email.
Batch Sending
Batch sending is the practice of delivering a single email campaign to a large list in groups or waves rather than all at once.
Bounce Classification
Bounce classification uses SMTP codes (550, 551, 552, 553, 554, 450, 451, 452) and enhanced status codes to categorise permanent and transient delivery failures.
Bounce Management
Bounce management is the process of handling emails that are rejected by mailbox providers, including classification, removal of bad addresses and protection of sender reputation.
Complaint Rate
Complaint rate is the percentage of delivered emails that recipients mark as spam, a key indicator of sender reputation and list quality.
Frequently Asked Questions
It is how mailbox providers judge your sending IP address based on history, identity, list health and engagement, which decides whether your mail reaches the inbox.
Consistent authenticated sending, clean permission-based lists, low bounces and complaints, and strong engagement signals build and sustain a good IP reputation.
Use Postmaster-type feedback tools from providers and reputation monitoring services to see how your sending IP is performing and where issues arise.