Hi marisolbritton !
With Emails issues, there could be many reasons. On the server side, on the client side...
However, the good news is that you are mentioning that it was working fine and the logs says it was successful. Have you tried to send the parcel to another email (outside of your company one)?
Are you using OneStreamEmail or a custom SMTP server? It is also possible that the email gets parked and it will come later (How long ago did you run the parcel?).
In the worst case, did you try the IIS reset?
Cheers