Invoice Email Messages statuses and Error Messages

Different Types Of Statuses: 

1. Sent: Email has been sent.
2. Pending: Email is about to be sent.
3. In progress: Email is about to be sent.
4. Partial In Progress: In cases where there are two or more email receipts, if one is sent, the system will send the remaining ones over the course of the following two or three days.
5. Partial Sent: Only a few emails will receive it because one or more of them have been blocked due to an incorrect email address or the recipient's email server rejecting emails, etc.
6. Permanent Failure: The system cannot send emails because all To addresses are blocked or wrong.

Note: If we have both an error and the status 'Sent', it means that emails have been sent successfully to all recipients. The error message was related to earlier, unsuccessful attempts to send emails, It succeeded in the subsequent tries.