Use a professional sign off at the bottom. Below your cover letter, write the word 'Enclosure'. If you're adding multiple documents, opt for 'Enclosures' instead. Include your list.
On a paper business letter, you often include the CC line underneath your signature, either above or below any enclosures line. Here are the various abbreviations you can use to note carbon copy on printed business letters: cc: c.c.
Under your name at the end of the letter, skip two lines. On the third line, write "Enclosure:" or "Enclosures:" if there are multiple documents. Skip a line after "Enclosures:" and then begin your list of enclosures. Put each enclosed document title on its own line.
If something is enclosed with a letter, the notation “Enclosure” is typed a double-space below the writer's initials and/or typist's initials. If more than one item is enclosed, the word is made plural and followed by the number of items (e.g., “Enclosures 2”).