On Thu, 2018-04-26 at 13:41 -0700, L A Walsh wrote: > To my way of thinking, dropping someone else's email, > telling the sender the email is being rejected for having > spam-like characteristics and telling the recipient nothing > seems like it might have legal liability for the for the > user potentially missing vital email. > > It also would seem to violate what used to be a basic > expectation of internet email -- that it is either delivered > to the recipient's inbox OR you'll receive a > non-delivery notification (a "bounce").
Rejecting the message during receipt causes the sending server to generate a bounce. If it's at all functional.