Hi, I have a serious issue, coz it is a very formal email and I really shouldn't resend it until I am sure that delivery was failed. I sent the email via gmail few days ago (attachment 23 GB), in 2 hours got an auto-reply about the delivery. However, on the next 2 days I was getting an auto-generated warning about some kind of deadline failure from the gmail, and today got like "Delivery to the following recipient failed permanently". So, what am I supposed to do? Is there any chance that the recipient has got my mail fully or not?