Read-write. Indicates whether a document is saved to a database when mailed. Only applies to new documents that have not yet been saved.
Boolean
To get: flag = notesDocument .SaveMessageOnSend
To set: notesDocument .SaveMessageOnSend = flag
When SaveMessageOnSend is True, the document is saved just after being mailed.
IsSaveMessageOnSend property in Java™ Document class
@MailSavePreference function in formula language