Thanks for posting! What was different about the previous email--was there something in the subject line that could have caused the email to be blocked? Maybe there was more images than text?
I'm happy to take a closer look for you and see what I can find out if you would like. If so, please let me know the name of the email with the larger bounce amount as well as the name of the most recent email you are looking at.
Thanks for posting. I understand that the phrase "not delivered" can be confusing. This indicates that the email address bounced back. There are a number of different bounce types including blocked, non-existent, vacation/auto reply, undelivereable and more. You would want to go to the bounce reporting for the specific email to see this reason.
To do this, click the Reporting button on the left and then scroll until you see the email in question. Click the name of the email and then click the hyperlinked number of bounces at the top.
Hope this helps,