Thought I'd write about an example of the changing times. Although many of us make extensive use of Email these days, there are many in the younger generation who don't have time for "old fashioned" things like Email. They are too busy talking or texting on their cell phones!
Sometimes, this is the reason that we don't see answers to our Emails. Of course, our Emails also might not get past a spam filter, the answer might not get past a spam filter, or there may be any other number of technical explanations.
In summary, if an Email is important and you don't receive a response, verify that it was received by sending another Email or trying an alternative means of communication.