Jeremy Kitchen wrote:
I wouldn't say never. If you had authenticated SMTP set up you could
always send the notification back to the sender using the username
supplied during the SMTP authentication process. After authentication
has succedeed of course. :)
rejecting the message should alert the user that something is wrong. Most
MUAs will say "hey! they didn't take my mail!" and only outlook won't tell
you why.
5xx Message rejected because of infection with Worm.YouSuck.Loser
Well, rejecting a message does alert the user if the user is sitting behind
their mail client that sent it. Most viruses have their own engines to
send out copies of itself. While the 5xx response message is still sent
back it never makes it to the person using the computer to make them
aware of the rejection.
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