Final answer:
The best way to begin a request e-mail or memo is to use a proper salutation and state the purpose of your email in the first couple of sentences.
Step-by-step explanation:
The best way to begin a request e-mail or memo is to use a proper salutation, such as "Dear" followed by the person's title and last name. This shows politeness and respect towards the recipient. Then, state the purpose of your email in the first couple of sentences to clearly convey your request.