You can easily check at any time all the email addresses that have been unsubscribed from your messages (voluntarily or automatically) under Recipients > Channels > Emails > Unsubscribed. Here you can also filter unsubscribed based on:

Unsubscribe type

Type
Error code
Description
Admin action (manually unsubscribed)0Unsubscribed by the administrator by changing the user status
Recipient used unsubscribe link2Unsubscribed by the user by clicking on the unsubscription link included in your message
Admin action (imported as unsubscribed)4Unsubscribed during the import process, by selecting the advanced option Import as unsubscribed (opted out)
Bounce8Automatic unsubscription due to incorrect email. More info
Due to spam complaint16Recipients clicking the "spam" button in the webmail client (e.g. Yahoo, Gmail etc.)
List-Unsubscribe http32Recipients unsubscribed through a unsubscribe button in the webmail client (e.g. Yahoo, Gmail etc.)
List-unsubscribe mail64Recipients unsubscribed by sending an email to their ISP/webmail provider
Bounce (generic error)80Automatic unsubscription due to generic errors
Email was incorrect (bad syntax)81Email addresses with syntax errors (e.g. without a "@")
Email was invalid (bad domain)82Email related to a no longer existing domain
Email was incorrect (abandoned account)83Email address that was abandoned by the user. More info
Due to inactive recipient128Users who have not performed any activity in the latest period. More info
Due to blocked email256Email blocked. More info

Due to repeated bounces

512Email automatically unsubscribed due to repeated soft bounces. More info
Unsubscription due to right to be forgotten1024Unsubscribed by the administrator after that the user has exercised the right to unsubscribe with the right to be forgotten and subsequently erasure of personal data collected
Due to blocked email (target MTA block)2561Email blocked due to known spammer. More info
Due to blocked email (spam content)2562Email blocked due to spam content detected. More info
Due to blocked email (target MTA configuration error)2563Email blocked due to recipient configuration error. More info
Temporary opt-out due to repeated bounces5121Email temporarily unsubscribed due to repeated soft bounces. More info
Permanent opt-out due to repeated bounces5122Email permanently unsubscribed due to repeated soft bounces. More info