| Processed | Message has been received and is ready to be delivered. |
| Dropped | This could be caused by any of the following drop reasons: Invalid SMTPAPI header, Spam Content (if spam checker app enabled), Bounced Address, Spam Reporting Address, Invalid, Recipient List over Package Quota. |
| Delivered | Message has been successfully delivered to the receiving server. |
| Deferred | Recipient’s email server temporarily rejected message. |
| Bounce | Receiving server could not or would not accept message. |
| Open | Recipient has opened the HTML message. |
| Click | Recipient clicked on a link within the message. |
| Spam Report | Recipient marked message as spam. |
