odoo15 email format suddenly wrong

Question

I don't know what happened, but suddenly my email format changed and now looks quite ugly.
https://transfer.sh/D1BXiq/Bildschirm%C2%ADfoto 2022-11-30 um 11.24.39.png
As visible on the screenshot, the top part is still formatted correctly but the bottom part suddenly spans over the entire device width instead of the previous way

Also, the company logo is not showing up anymore at the top right.
I originally suspected the web.base.url [1]   is wrong but I checked it and it seems to be set correct

Josef Werner Schmid GmbH, Josef Schmid · Accepted Answer

it turns out it was a third party module called mail_debrand that caused the error

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