At some stage , we all send an email message which we suddenly think "Gosh, I shouldn't have sent that" !!
It might be a missing attachment, a message which needs more data...there are many reasons why we should not have clicked the Send button !!
Well, help is at hand. There is an option available in Gmail that allows us to "recall" a sent message. All we need to do is to set an option to "Unsend"
Here is the video to show you how.....problem solved !!