The encoded_id in emails is not hidden enough

We are told that the encoded_id is hidden in emails to customers but I find it waaay to visible in my opinion. In some cases, like in the Outlook mobile app, we barely see the content of the email and just see a giant code (the encoded_id)! This code is not appealing and having it visible before even opening the email makes our email look like spam/scam. 

See screenshots attached for examples.