XF 1.5 How do I block inserting images from specific sources?

How do I do that if I don't want people to insert images from a specific image hosting? Should I simply add the domain name to the blacklist or?
 
Yeah I meant censoring when I said blacklist. I guess there isn't any option else, right?

What if I want to allow inserting images from only one domain? Like, only from imgur.com?
 
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