邮件发送错误的N个问题总集，请热心人帮忙！

maomaoli

问题一：<br>
xiaojiang612427@163.com : 521 CoremailSys:Your message was blocked by NetEase AntiSpam+..(okC99fcogUNH95AC.1.U.0)<br>
问题二：<br>无法将您的邮件投递至以下指定地址:<br>
xiaojiang612427@yahoo.com.cn : 451 VS5-MF Excessive unknown recipients - possible Open Relay <a target=_blank href=http://help.yahoo.com/help/us/mail/spam/spam-18.html>http://help.yahoo.com/help/us/mail/spam/spam-18.html</a> (#4.4<br>
问题三：<br>
xiaojiang612427@163.com : 455 Error, Fail to Send E-Mail<br>
问题四：<br>451 mta105.mail.cnb.yahoo.com Resources temporarily unavailable. Please try again later [#4.16.5].<br>
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感谢一切回复和路过绑定的朋友<img src="../leadbbsfile/UBBicon/em14.GIF" width=20 height=20 align=absmiddle border=0>

maomaoli

感谢一切回复和路过帮顶的朋友！！！

rayer

1.邮件内容或主题等被对方判断为垃圾邮件而拒收了<br>
2.一定要使用SMTP发信身份认证功能，要不然yahoo会拒收你的邮件地.<br>
3.好象是网易内部的错误<br>
4.临时性错误，过一段时间再试就行了

maomaoli

启用了SMTP发信认证!<br>
问题三在对163和YAHOO等发信时依旧存在

rayer

好象在启用认证以后要写信通知一下yahoo，然后过一段时间他们就会放行了。