看上去原因很明显, sendmail 找到了 qq.com 的 mx
服务器
mx0.qq.com , 但无法解析域名~~
由于 sendmail 在支持IPV6的情况下会优先发送查询 AAAA 记录, 如果服务器返回了 SERVFAIL 而非 NODATA 那么 sendmail 就认为查询失败
host -t AAAA mx0.qq.com
返回Host mx0.qq.com not found: 2(SERVFAIL)
host -t A mx0.qq.com
返回mx0.qq.com has address 64.71.138.90
mx0.qq.com has address 64.71.138.80
mx0.qq.com has address 64.71.138.81
mx0.qq.com has address 64.71.138.82
mx0.qq.com has address 64.71.138.83
mx0.qq.com has address 64.71.138.84
mx0.qq.com has address 64.71.138.85
mx0.qq.com has address 64.71.138.86
mx0.qq.com has address 64.71.138.87
mx0.qq.com has address 64.71.138.88
vi /etc/mail/sendmail.mc
加到最后一行: define('confBIND_OPTS', 'WorkAroundBrokenAAAA')dnl
然后make
重启sendmail
本文介绍了解决sendmail在尝试连接QQ邮件服务器时遇到的域名解析失败问题。通过配置sendmail以绕过IPv6 AAAA记录查询失败的情况,成功实现了邮件发送功能。
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