Can not load images in emails

after searching for a solution I was not able to find one,

I have a website (not WP) that sends emails upon registration and other activities.
The images like logo or products are not being loaded at all.
I clicked on the image URL and can see only :

404. That’s an error.

The requested URL /proxy/WaRK2sobgbT0reZiHfyFDP9Af_SjyigW2DsVfKHfnBEunyqva4xJgoVITs5F6hi42ozyEAZUBJ6UyvkFbC_Zq_unpU9cMnXmBVwpLWX4q3uMn447VbJZxOaEobwmsvbMwZZ-xN9AZhDD9_TSteFBEH4A=s0-d-e1-ft was not found on this server. That’s all we know.

The scrape shield is off and the cache is cleared for few weeks.
I use external SMTP server via using my domain. The email box is fully working I can send and receive emails, but as soon as do it automatically via the website , images are missing.

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