Linux6.5发送邮件时，异常postdrop: warning: inet_protocols: IPv6 support is disabled: Address family not supported by
报错信息：
sendmail: warning: inet_protocols: IPv6 support is disabled: Address family not supported by protocol
App 12838 stdout: sendmail: warning: inet_protocols: configuring for IPv4 support only
App 12838 stdout: postdrop: warning: inet_protocols: IPv6 support is disabled: Address family not supported by protocol
App 12838 stdout: postdrop: warning: inet_protocols: configuring for IPv4 support only
App 12838 stdout: postdrop: warning: unable to look up public/pickup: No such file or directory
App 12731 stderr: Rendered mails/mail_successed.html.erb within layouts/mails (0.5ms)
App 12731 stderr: Rendered common/_top.html.erb (1.5ms)
App 12731 stderr: Rendered common/_mail_manage.html.erb (0.9ms)
App 12731 stderr: Rendered common/_footer.html.erb (0.1ms)
解决方法：
（1）修改# /etc/postfix/main.cf 这个文件
（2）修改内容： 把inet_protocols = all 修改为inet_protocols = ipv4
(3)报存退出 wq!
(4)重新启动# /etc/init.d/postfix restart使修改生效
(5）OK
参考文章：http://blog.hexu.org/archives/1702.shtml