David,
Please post a JPEG screenshot of your settings.
Attached!
Thanks
Since you're not doing anything that would cause the image to be manipulated (JPEG quality less than 100, limiting file size, watermarking, converting to sRGB, etc.) and you're not resizing, the original is being sent.
The 'Preserve EXIF where possible' option when unchecked isn't an explicit 'strip EXIF if it exists' feature. It won't cause a file to be modified by itself.
So you'll either need to strip your images before you send them or cause your image to be modified. I suggest limiting the file size since sending an original to someone via email is likely to be rejected by the recipient's email server.
-Kirk