Instead of going to mail forwarding tab stay in general take.
Click button that says 'Ask before displaying external images'
Save changes and your good to go.
I did this. I found it exactly where you said it would be and changed the setting. But it isn't blocking images. I had someone send me an email with a picture and it showed up. Images in all my other emails still show up as well. Is there a known delay when you apply these settings?
For me I have a GMAIL user account to check all of mine.
All of my accounts are pre filled in, I have a list of my 15-20 accounts per week I rotate so I know which ones are active and check the gmails by only using a user account set up just for that.
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