Hello,
Can you please accept this feature request to add MapiMessage.XMailer property?
To conform with MailMessage, and also in case we load eml to MapiMessage.
Even if not used directly in mapi message itself, it can…...save it as: Oft , Eml , Emlx , Mht , Tnef You can see X-Mailer header...claimed to be fixed in 23.3: 1st; mht does not get XMailer, but I guess...