While a simple "Hi," "Hello," or even "Hey" is appropriate in casual correspondence, a more formal salutation is appropriate when you are emailing about a business_related matter, such as a cover letter, letter of recommendation, or inquiry letter.
Signature Examples for Emailed Documents. When you are sending email cover letters, it's important to include contact information so the hiring manager can easily see how to contact you. At the very least, include your name, email address, and phone number. You can also add other, optional information, such as your street address, online portfolio, or social media accounts.