Retrieves information about messages specified by the MessageSet property.
public func fetchMessageInfo() throws -> Void
This method retrieves information for the messages specified by the MessageSet property. This includes information about the message envelope as well as message structure. Every time a message envelope is retrieved, a MessageInfo event is fired, and message envelope information is stored in properties such as: MessageSubject, MessageFrom, MessageRecipients, etc. If the message is a multipart message, one or more MessagePart events are fired before the MessageInfo event - one for each message part.