See also: Bounce management in Ometria
Emails that did not reach the sender because it was determined that the content is spam, the IP has a poor reputation or a number of other filter verdicts.
These emails are rejected at the server level and never reach the intended recipient.
A common reason for a blocked bounce is the sender being on a blocklist, or the sender has low reputation scores with the destination inbox provider.
Ometria does not add blocked bounces to the suppression list as they may be temporary.
Blocked bounces are included in your bounce rate metrics.