Two messages are appropriate,
Explanation:
Memoranda of Interoffice (memos) are used to communicate with each other among workers within a company. There are four memo headings available: TO, FROM, SUBJECT and DATE. Normally the memo will be submitted in a handwritten form with the names of the organization.
It is mainly aimed at gathering and transmitting information and making short appeals. A memo has always been relevant in the business community, as it leads to good relations. It also helps to make matters transparent and saves you effort and time rather than writing letters.