[root@mail bin]# rpm -qa postfix
postfix-2.5.9-5.ired

系统安装以后，本地的邮箱可以相互发送，但是无法向外部的邮箱发送邮件，好像接收邮件也是一样。
是否是因为安装的时候选择了spf，这个东东如何删除啊

Jan 14 17:01:15 mail postfix/smtpd[5081]: NOQUEUE: reject: RCPT from unknown[58.83.160.12]: 450 4.1.8 <customer_service@360buy.com>: Sender address rejected: Domain not found; from=<customer_service@360buy.com> to=<adam.chen@amtiumnet.com> proto=ESMTP helo=<360bu1.360buy1.com>、

Jan 14 16:59:03 mail postfix/smtpd[5234]: NOQUEUE: reject: RCPT from unknown[183.62.127.194]: 450 4.1.8 <28036630@qq.com>: Sender address rejected: Domain not found; from=<28036630@qq.com> to=<lxb@amnoon.com> proto=SMTP helo=<smtpbg238.qq.com>

Jan 14 17:07:42 mail postfix/smtpd[5365]: NOQUEUE: reject: RCPT from unknown[196.1.0.70]: 450 4.1.2 <28036630@qq.com>: Recipient address rejected: Domain not found; from=<lxb@amnoon.com> to=<28036630@qq.com> proto=ESMTP helo=<fisher-PC>
Jan 14 17:07:44 mail postfix/smtpd[5365]: disconnect from unknown[196.1.0.70]