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Glossary · Published 2026-09-29 · AgentiSend team

Block bounce

Block bounce: A refusal on reputation or content. The address itself is not the cause.

A block bounce means the receiver refused the message on reputation or content. The address can be real. Treating it as a dead address sends you to clean a list that is fine.

This is the class that ends in a blocklist if it continues. Cut volume on the domain and read the complaint rate. Recipients who never asked for the mail are the usual cause.

Related terms

  • Policy bounce — The address is real. This message was refused for size, an attachment, or suppression.
  • Complaint rate — The share of delivered mail that recipients mark as spam, judged by the ladder.