Mail发不到qq.com和yahoo.com.tw怎么办

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