It would be so nice if gmail had an option of return receipt. So this way when you email someone you would know when they looked at it so you wouldn't have to keep sending them emails. I know return receipt is a function of outlook.
http://support.google.com/a/bin/answer.py?hl=en&answer=1385059 Looks like it is just for the Business, Education and Government customers. That does suck...
