I am writing this article with no background whatsoever in its topic. I really have no idea what an email search really is and so in the next few paragraphs I will consider what I can be as well as the utility of such a thing.
Email search well I guess it could be a new computer users search for the ever elusive email account of their own. But then again this person would literally have to be senseless because everyone and their brother is bombarded with offers for free email accounts from all manner of connections including your magazine subscription, your church, your school, your favorite restaurant etc. So if it is really someone looking for an inbox of there own it is more a weed-out than a search because you will do more turning down of offers than searching them out.
So what else could it be? Well here maybe is a more legitimate possibility, especially as the computer age completely overtakes us. Rather than doing a snail mail address search, or a phone number search, maybe an email search is the hunt that we all do when we want to contact somebody but dont know how. I know for a fact that I find email way more convenient to use as a line of communication...