主题: 501 5.1.7 Bad sender address syntax 要怎麼強制改成discard

最近收到很多類似不正確的sender from=<@yahoo.com> 的sender
可是都會退信給yahoo , 反正sedner就是錯的,退信也不知退給誰, 想直接discard刪掉
要怎麼設定?

May 24 08:56:05 mail postfix/qmgr[58572]: 241EB4B29FF: from=<@yahoo.com>, size=2818, nrcpt=1 (queue active)
May 24 08:56:14 mail postfix/smtp[36105]: 241EB4B29FF: to=<my@my.com>, relay=127.0.0.1[127.0.0.1]:10024, conn_use=2, delay=12, delays=3/0/0/9.4, dsn=5.1.7, status=bounced (host 127.0.0.1[127.0.0.1] said: 501 5.1.7 id=31829-06-2 - Rejected by MTA on relaying, from MTA([127.0.0.1]:10025): 501 5.1.7 Bad sender address syntax (in reply to end of DATA command))