For months I have had an issue when using a browser to view emails, the pictures would not autosize to the screen width, instead I would only see for instance the left hand third.
Anyway, today it has somehow been fixed so I can now read emails properly.
Thank you whoever fixed it.
It sounds like it was more of a setting in the browser issue than a BTMail issue.
It may have been resolved if there was a browser update which re set the setting.