Quoting s. keeling (keeling@spots.ab.ca): > However, I _would_ like to STOP it from being delivered at all, as > defined by simple rules like those above. As far as I can tell, this > must be done in the SMTP negotiation phase. Mostly. > What's it going to cost my ISP to implement this? Is it feasible for > an ISP to implement this? Is it feasible for them _not_ to? ;->