Not sure if this is a bug, an intentional design, or some sort of user error on my part.
One of my users forwarded an email message to a private category. I saw it immediately, and since I hadn’t changed the forwarded_email setting to include the text, it was basically empty. I added that text to the body of the post. I also changed the title of the post, since the forwarded email Subject line wasn’t descriptive of why it was being sent to the category.
When I received the email version of the post after the 10-minute editing window had elapsed, the changes I had made to the body of the post were there, but the email Subject had not changed to reflect how I had modified the title.
That seems wrong—shouldn’t any change to the post within 10 minutes be reflected in the email that goes out?