在檢查 maillog 時出現以下信息, 請問如何防止

ckwong

在啟動 sendmail 後, 檢查mail log, 發現出現後多的 不正常log 如下,
請問如何防止
<beckys@oasistech.net>... User unknown
Mar 25 12:41:52 www sendmail[16344]: i2P4fpbS016344: lost input channel from mx6.go2ebuy.com [216.39.87.46] to Daemon0 after rcpt
Mar 25 12:41:52 www sendmail[16344]: i2P4fpbS016344: from=<adv@go2ebuy.com>, size=0, class=0, nrcpts=0, proto=SMTP, daemon=Daemon0, relay=mx6.go2ebuy.com [216.39.87.46]
Mar 25 12:42:02 www sendmail[16331]: i2P4ewbS016316: to=<kkehe@nmbqe.mailserver.idv.tw>, delay=00:01:04, xdelay=00:01:00, mailer=esmtp, pri=120390, relay=mail.mailserver.idv.tw. [218.32.227.125], dsn=4.0.0, stat=Deferred: Connection timed out with mail.mailserver.idv.tw.
Mar 25 12:44:30 www sendmail[16345]: i2P4iUbS016345: <EDIAZ@OASISTECH.NET>... User unknown
Mar 25 12:44:31 www sendmail[16345]: i2P4iUbS016345: from=<camera@b2c-mail.com>, size=0, class=0, nrcpts=0, proto=ESMTP, daemon=Daemon0, relay=mx1.lm-net.net [69.59.177.4]
Mar 25 12:49:12 www sendmail[16349]: i2P4nCbS016349: <batman@oasistech.net>... User unknown
Mar 25 12:49:13 www sendmail[16349]: i2P4nCbS016349: from=<coups@pagrus.net>, size=0, class=0, nrcpts=0, bodytype=8BITMIME, proto=ESMTP, daemon=Daemon0, relay=[69.42.77.130]

Snoopy

是不是open relay啦?

你smtp有认证吗?

ckwong

我是沒有設定 open relay 和 smtp有认证