HTML emails with wider layouts are rendered wider than the screen on mobile. The right side of the message is cut off and the message view does not allow horizontal scrolling/panning, so the content on the right cannot be read or interacted with.
Hey @SirWurzi welcome to the Nextcloud community forum 
please consider posting your report on the devolepers GitHub: GitHub - nextcloud/mail: 💌 Mail app for Nextcloud as sadly not all developers hang out in the community forum.
when done, feel free to link the bug report here for reference 
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