~~~backscatter Inverse scattering problem ~~~ mail Postfix+ do smtpd_sasl_authenticted Question : Telnet localdomain 25 Mail from : "aUser@163.com>; Ok Rcpt to:<unknowusers@localdomain>; Ok I wonder when local users send mail bombs reverse a return to the 163.com users. We do not need any certification. I would like to direct users unknown discarded mail, it should be. Boss who help. ~~~backscatter Inverse scattering problem ~~~ mail Onegai. . Please take care of you. . . Thanked the first. [ Closed window ]