So far with the last week I have three clients who reported that they didn't received the email (invoice) but it shows the sent on the status.

Today I was working on the client computer and watching her inbox. I send the invoice and she didn't get it. I have to resend the second time after waiting 3 - 4 hrs.

Does the system update the Sent status if the email bounce? Is there a way for us to view bounce email?