not really exchange related. i was wondering how spammers are able to forge the TO: header of an email so that you get the email even though its not addressed to you. like if i'm joe@xxxxxxxxxxxxxx, i get an email to my inbox addressed only to bob@xxxxxxxxxxxxxx or bob@xxxxxxxxxxxxxxxxxxx? is it that the envelope headers are addessed to me but the email TO: headers are changed? Is this this the same thing as when you get spam and the TO: headers say "undisclosed recipients"? thanks