Following is a list of bounce classification codes and their meanings:
|The response text could not be identified.
|The recipient is invalid.
|The message soft bounced.
|The message bounced due to a DNS failure.
|The message bounced due to the remote mailbox being over quota.
|The message bounced because it was too large for the recipient.
|The message timed out.
|The message was failed by SparkPost's configured policies.
|Generic Bounce: No RCPT
|No recipient could be determined for the message.
|The message failed for unspecified reasons.
|The message was blocked by the receiver.
|The message was blocked by the receiver as coming from a known spam source.
|The message was blocked by the receiver as spam.
|The message was blocked by the receiver because it contained an attachment.
|The message was blocked by the receiver because relaying is not allowed.
|The message is an auto-reply/vacation mail.
|Message transmission has been temporarily delayed.
|The message is a subscribe request.
|The message is an unsubscribe request.
|The message is a challenge-response probe.
undetermined are usually temporary events. If you'd like to filter on suppression-level events, only check for
admin bounce-type events.
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