Mail activity log

Under Reports – Activity Log – Mail Activity Log, you can also view your email history.

You can sort the columns by clicking on the headers.

The statuses are updated as emails are received. Invoices that have not been delivered correctly will be flagged in the invoice list, in which case you should check the log and take the necessary actions.

Delivery events include: processed, dropped, delivered, deferred, and bounce.

Processed = Message has been received and is ready to be delivered.
Dropped = You may see the following drop reasons: Invalid SMTPAPI header, Spam Content (if Spam Checker app is enabled), Unsubscribed Address, Bounced Address, Spam Reporting Address, Invalid, Recipient List over Package Quota
Delivered = Message has been successfully delivered to the receiving server.
Deferred = Receiving server temporarily rejected the message.
Bounce = Receiving server could not or would not accept mail to this recipient permanently. If a recipient has previously unsubscribed from your emails, the message is dropped.
Blocked = Receiving server could not or would not accept the message temporarily. If a recipient has previously unsubscribed from your emails, the message is dropped.
Open = Recipient has opened the HTML message