EmailDLL Online Manual
Parameters: SubjectText, a string containing the subject line
Returns: Success or Error Status
This method sets the subject line for the email message. While it is a great benefit to the recipient to have a subject header line, this method is nonetheless optional. You should include a brief summary of the intent or contents of the email on this line. But remember, most email clients display relatively few characters from the subject line in the message list, so shorter is better.
This method returns an integer indicating whether the method was performed successfully or not.