We normal sent email to other user mailbox.
If the email does not delivered, we will receive back the bound back email.
Sometime we send email out, there is not bound back email. But receiver (my friend) complain me that I did not send email to him.
*Sometime the email is sent to the receiver, but the mail server receiver side, categories my mail server domain as a "spam". So the email will go to SPAM mail.
So, Can zimbra trace sent mail? We need to comfirm that the mail really 100% sent. [No assume]. How can it trace?