The Lua management function 'VPOP3.MarkMessageRead' marks or unmarks a specified message as read.

VPOP3.MarkMessageRead(username, folder, UID, read);

• username is the username from VPOP3.GetUsers
• folder is the folder from VPOP3.GetFolders
• UID is the UID from VPOP3.GetMessages
• read is true if the message is to be marked as read, or false if it is to be marked as unread