怀疑邮箱密码被盗改强密码后仍然收到此类邮件
发件人： xwsu发送时间： 2011-08-15 08:49:46
收件人： sales.f
抄送：
主题： MAIL SYSTEM ERROR - RETURNED MAIL
This Message was undeliverable due to the following reason:
Your message was not delivered because the destination computer was
not reachable within the allowed queue period. The amount of time
a message is queued before it is returned depends on local configura-
tion parameters.
Most likely there is a network problem that prevented delivery, but
it is also possible that the computer is turned off, or does not
have a mail system running right now.
Your message was not delivered within 8 days:
Host 212.230.123.2 is not responding.
The following recipients did not receive this message:
<sales.f@sanhe-mould.com>
Please reply to postmaster@gsl.com.cn
if you feel this message to be in error.
配置一下SPF吧，如果你确定没有发邮件给那个人可能就是退信攻击了，也就是说别人伪造你的邮箱发信了。
在域名控制面板中添加TXT记录：
domain.com到v=spf1 a mx -all （假如你的域名是domain.com）
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