Recently sent out an internal only holiday email to a group of associates. Due to the content from our team we set it up as an image only email, which was out of the norm for us but worked well in this situation. The other thing we didn't include was a preheader.

We had one user who is in the Boxer app on Android notice that his preheader was was filled in with Lorem Ipsum Image Included. There's no Lorem anywhere in the code so I'm wondering if this is default behavior or something else going on? We're sending through Marketing Cloud. Are there other clients that do this as well?