Mail to the Chief of Security is a file that can be found in Resident Evil: The Umbrella Chronicles. It is largely similar to the Mail from the Chief of Security file from the REmake, except the final paragraph and sender is removed.
The file is found on a gurney at the corner (right behind a Crimson Head.
Mail to the Chief of Security
Attn: Chief of Security
Date: July 22, 1998 2:13
X Day is drawing upon us. Execute the following procedures within one week. Prompt actions are demanded.