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Python 2.7
I noticed a recurring bug we've had attempting to send a particular JPEG image in emails:
email.mime.image.__init__
<unknown>: Could not guess image MIME subtype
After looking into the imghdr.what and tests source code, I noticed that this JPEG image begins with the following data: 
'\xff\xd8\xff\xee\x00\x0eAdobe\x00d\x00\x00\x00\x00\x00\xff\xed\x008Photoshop '
I've attached the image in question to this bug report.
There's two functions for asserting an image is JPEG format, test_jpeg and test_exif. I'd like to propose another function for resolving Adobe Photoshop image formats.
Unless, of course, this is expected behavior?
Thanks!