In several different ways. The most notable improvement on using computers over not is in writing. Before computers, you would need to physically type a rough draft, make changes, rewrite the whole paper, make changes, rewrite, so on and so forth. With computers, you can make minor &/or significant changes with rarely a need to rewrite the whole document. Also, email has helped make communications easier. No longer does an actual mailman have to take your handwritten letter, give it to the post office who has to process it, transport the letter to a different city (if applicable), and give it to another mailman to give to the recipient. Now you can just type it up, click send, and it's there (assuming no server problems, etc). The whole idea of shopping on the web has made communications easier. One can type in almost any item they wish to buy, get several price quotes, and actually go through the transaction to purchase the item without need to go to the store or pick up the phone. Computers have also led up to many other communications tools like cell phones, VoIP, encryption, etc.
These days it's Facebook that's the best way to identify the sender of a (valid) email address. Facebook has over 450 million users worldwide and it allows you to search via email. Here's how you do it:
a) Log-in to Facebook. You can't search by email unless you're logged in.
b) In the search box on the top, type the email address.
c) If a person with that email is registered on Facebook, you should be able to see his first/last name. Now, add him as a friend :D
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