mouss wrote:

I think image with not text in the body part at all is pretty rare, but
I might do something like that if I was sending a picture to myself.


and when I send an email to myself with only an image attachment (using thunderbird), this is what I see (note the presence of Content-Type: text/plain):

To: t...@example.com
Subject: test
Content-Type: multipart/mixed;
 boundary="------------000708050006030009060103"

This is a multi-part message in MIME format.
--------------000708050006030009060103
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit


--------------000708050006030009060103
Content-Type: image/jpeg;
 name="back_search.jpg"
Content-Transfer-Encoding: base64
Content-Disposition: inline;
 filename="test.jpg"



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