No. The sanitization process is there for very good reasons and cannot be overseeded. By trying or doing so, you’ll run into issues you’ll receive no support for and that are not bugs and thus are no issue candidates.
Yes I know. Sanitization should be done for some kind of tags and scripts. But removing CSS styles like colour and background is not necessary at all, is not a risk for security. However, could be fine if the sanitization is done in customer - agent side, assuming is malicious actor, but, what’s the point of doing this via API with an admin account?
I see it like you and for me it is absolutely important to highlight some text sometimes to show its importance. There should at least be an option to disable the sanitization for a specific mail or allow specific styles like color, background-color, font-size.
I never wrote anything about security issues. While yes, it also ensures “evil content” is alright, it’s more about ensuring you can actually read the content as good as possible.