Character Vector
Valid for: GetMail, SendMail
The subject property contains the subject of an e-mail, as a character vector.
For the SendMail object, you should set this property before calling the SendMessage method.
For the GetMail object, this property is read-only, and is valid only after you have called the GetMessage or GetSummary method to retrieve an e-mail (or summary of an e-mail) from the POP3 server.