With todays update, the mail is now filling in the title with the item you are trying to mail. It didn't prior to today's patch, so I assume this was part of the patch.

However, it will not let you send the mail with the automatically filled in subject. You have to go into the subject box and type something for the send button to activate. You can delete the added text once you type, and still send.

It seems as if the button is activated when you type in the subject box and that the automatically entered item name is not triggering the event the same as typing in the box does.