sendmail problem stat=User unknown
i am using mdk 10.0
sendmail 8
Oct 7 18:50:00 localhost sendmail[5511]: j97AntBG005511: to=poissonslam@hotmail.com, ctladdr=apache (74/74), delay=00:00:05, xdelay=00:00:05, mailer=relay, pri=31088, relay=excellence.homelinux.com. [221.127.31.248], dsn=5.7.1, stat=User unknown
why stat=User unknown
,do i need open port 587? coz i block it
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