Ah, I've got it backwards! I meant originally that the pubmail email could be seen as having been read, but that was my backwards thinking that the politician w

Ah, I've got it backwards! I meant originally that the pubmail email could be seen as having been read, but that was my backwards thinking that the politician would be the one using the pubmail address. This way, yes, it would be impossible to get a return receipt without image/js or something.