It is necessary to wrap all mail from one client (the IP address from which the letter is sent) or mailbox (From field), in this case they are the only constants, to one specific mail address, and completely ignore the To field. How can this be done by regular means?
PS The only way I found is to enable local delivery of letters to the relay server for a particular client, and then use procmail to redirect the letters further.
tohave at leastccandbcc. see tools.ietf.org/html/rfc822#section-4.5 - aleksandr barakin