Just sign and date the signature, to officially "seal the deal" on the memo, and let the reader know who, exactly, the memo is coming from. It's more important, however, to end the memo with a firm call for action, letting your readers know what specific action is to be taken.

Does a memo have to be signed?

Unlike business letters, which clearly require a signature, memos are a different matter. ... Memos, however, are internal and usually only seen by a company's employees. In practice, memos don't include a signature. However, sometimes managers are wise to include their initials next to their name in the header.

What is proper memo format?

The format of a memo follows the general guidelines of business writing. A memo is usually a page or two long, single spaced and left justified. Instead of using indentations to show new paragraphs, skip a line between sentences. Business materials should be concise and easy to read.