Re:Email doesn't suck – it's email clients that need improving
by egberts1 on Friday August 26, 2022 @08:25AM
(#32606465)
Now you are getting the idea of how to design a new network protocol in contrast to adding the supporting numbers of parsers and validators.
Potential and actual vulnerabilities explodes, like the chronic problems of Microsoft Macros.
There is no "JavaScript" in JMAP in the sense that it's supported by the protocol, and the specification explicitly warns against email clients interpreting JavaScript.