You can find special notepaper with matching envelopes at fine stationery stores. For now, know that e-mail messages are less formal, less private, and more perishable than letters and memos. But they do get your message out fast, especially if you need to reach a lot of readers quickly. The reasons for writing letters and memos are different from those for writing e-mail messages, as you'll see in later chapters. E-mail is not a secure, confidential means of communicating.
Many companies admit that they routinely monitor employees' e-mail.
It's quite possible that companies that do not admit it are also monitoring e-mail. The motto is, Don't put it on e-mail unless you don't care who sees it. You have the time to write the piece and have it delivered. Want a personal touch, whether you know the reader or not. Need to reach many people with copies of the document.