I think I have found a workaround for the time being. Not sure why it works but it works for me.

I am using Outlook and when you generate the email with the attachment to send to a customer (I do estimates and sales orders) you can close out of the pop-up email window and save the draft. Once you access the drafts you can then edit the body of the email and send it on it's way. Hope this helps as a temporary fix for the Outlook users.