So, this is definitely coming soon: Email plug-in using ChatGPT to dynamically rewrite a small simple paragraph in an email so every recipient gets a unique version that can be traced to them.
@stads@SwiftOnSecurity I suspect if nothing else it is harder to strip out. You can canonicalise spaces and punctuation to a point, different wording that conveys the same information is harder to cover up when that is the actual information you're trying to leak