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邮件发送失败 550 未知主机

tag-icon • tag-icon dns sendmail
邮件发送失败 550 未知主机

尝试从我的 centOS 7 服务器发送邮件，但失败了。

以下是邮件的摘录，其中包含我认为的原因，但我不确定如何解决。

我相信我的主机文件中有正确的设置，但可能是错误的。

注意：我已将我的电子邮件地址替换为[电子邮件受保护]。

邮件日志也有 stat=sent。

The original message was received at Tue, 29 Nov 2016 10:46:18 GMT
from localhost [127.0.0.1]

   ----- The following addresses had permanent fatal errors -----
<[email protected]>
    (reason: 550 Host unknown)

   ----- Transcript of session follows -----
550 5.1.2 <[email protected]>... Host unknown (Name server: myaddress.com: host not found)

编辑

#/usr/sbin/sendmail -d8.20 -bv [email protected]  
Warning: OperatorChars is being redefined.  
         It should only be set before ruleset definitions.  
Warning: OperatorChars is being redefined.  
         It should only be set before ruleset definitions.  
Warning: OperatorChars is being redefined.  
         It should only be set before ruleset definitions.  
dns_getcanonname(myaddress.com, trymx=1)  
dns_getcanonname: trying myaddress.com. (AAAA)  
    YES  
dns_getcanonname: trying myaddress.com. (AAAA)  
    YES  
dns_getcanonname: trying myaddress.com. (AAAA)  
    YES  
dns_getcanonname: trying myaddress.com. (AAAA)  
    YES  
dns_getcanonname: trying myaddress.com. (AAAA)  
    YES  
dns_getcanonname: trying myaddress.com. (AAAA)  
    YES  
dns_getcanonname: trying myaddress.com. (AAAA)  
    YES  
dns_getcanonname: trying myaddress.com. (AAAA)  
    YES  
dns_getcanonname: trying myaddress.com. (AAAA)  
    YES  
dns_getcanonname: trying myaddress.com. (AAAA)  
    YES  
dns_getcanonname: trying myaddress.com. (AAAA)  
    YES  
dns_getcanonname: trying myaddress.com. (AAAA)  
    YES  
[email protected]... deliverable: mailer local, user email

答案1

执行以下命令可查看 sendmail.org/sendmail.com 发出的 DNS 查询：
/usr/sbin/sendmail -d8.20 -bv [email protected]

如果非特权用户执行命令没有结果，请以 root 身份执行该命令。

答案2

我现在可以使用了。为了他人的利益，这就是我所做的：

卸载了sendmail和sendmail-cf，这样我就可以开始新的
yum删除sendmail sendmail-cf

再次重新安装它们
yum install sendmail sendmail-cf

编辑 /etc/mail/sendmail.mc
将 LOCAL_DOMAIN 选项设置为您的计算机主机名 LOCAL_DOMAIN(`example.com')dnl

接下来运行
make -C /etc/mail
edit /etc/hosts
127.0.0.1 主机名 主机名.域名
172.16.213.146(我的内部 ip) 主机名 主机名.域名 域名

编辑 /etc/sysconfig/network HOSTNAME 应等于您的计算机主机名

最后运行
service sendmail restart

这就是我在虚拟机服务器上的工作原理，这里可能有一些不必要的步骤，我无法解释它们，但它使它工作了。感谢大家的意见。

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