The problem with images in the email

When you send the image in an email, I do not want to see.

But the campaign got different emails, and sometimes appears and sometimes not.

In doing so, preview and text in all cases is OK.



Any idea where to look for the problem?

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When you send the image in an email, I do not want to see.
But the campaign got different emails, and sometimes appears and sometimes not.
In doing so, preview and text in all cases is OK.

Any idea where to look for the problem?