Number of emails in the final failed state. This means emails that have
been refused by the target mail system with a final error status.
Number of emails still in the new transient state. This means emails
received from the API but not yet processed.
Number of emails still in the sending transient state. This means emails
received from the API but not yet in their final status.
Number of emails in the final sent state. This means emails that have
been delivered to the target mail system.
Total number of emails matching the requested criteria.
Number of emails in the final
canceledstate. This means emails that have been canceled upon request.