The reason Buttondown has marked the subscriber as undeliverable.
Undeliverable subscribers are not sent emails, and may be periodically removed from the system (or restored, if the reason is no longer valid.)
IP blocked
Type
ip_blocked
Description
The subscriber's email is considered spam.
Domain blocked
Type
domain_blocked
Description
The subscriber's email is considered spam.
Email blocked
Type
email_blocked
Description
The subscriber's email is blocked.
Out of storage
Type
out_of_storage
Description
The subscriber's mailbox is out of storage.
Disabled
Type
disabled
Description
The subscriber's email account is disabled.
Unreachable
Type
unreachable
Description
The subscriber's email is unreachable.
Access denied
Type
access_denied
Description
Access to the subscriber's email was denied.
Does not exist
Type
does_not_exist
Description
The subscriber's email does not exist.
Rate limited
Type
rate_limited
Description
Delivery to the subscriber's email was rate limited.