Rich Text Mail Format - Unable to change

Hello,

Recent tests in CM 23.4 have indicated that the way the "SEND TO MAIL" works has changed.  It seems now there is no way to NOT attach items as attachments - instead they are always embedded.  And, we are uable to de-select the bottom option as the second from bottom option is greyed out.. 

This results in a email like this.. the only way to switch it back is to use the Outlook button.  My Outlook default message is HTML.

Is there fix to the broken button.. and can it use the default mail format?