Images in email show related issues

Picture display problem in email
Is there a way to ensure that the images in the email are directly visible to customers by default? Just don't need the user to click "Allow Download" or "Show Picture".
Personal feeling is not good.
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If the message is sent in HTML form, the server does not set some anti-theft chain settings for the picture, most of which can be displayed directly
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Need to display pictures that is the settings of the mail site, some are not, this is not the sender can control.
For example, Gmail needs to display the image, 21CN is not.

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