Why can't show picture from some advertisement email? Thanks your help and answers!

Why can’t show picture from some advertisement email? how to solve this problem? I had set up already, signature or other picture can show from normal email. but from AD can’t. as advertisement of Airlines, hotels .Thanks your help and answers.

See this support post.

Remote Content in Messages | Thunderbird Help

Thanks your answer and reply. I had done before. My email show normally, email from advertisement as HTLM, then would be not show. Anyway, thank you!