CentOS筆記－Postfix fail: connect to aspmx2.googlemail.com[2607:f8b0:4001:c03::1b]:25: Network is unreachable

出現底下的問題：
connect to aspmx2.googlemail.com[2607:f8b0:4001:c03::1b]:25: Network is unreachable

Google了一下看到這篇[SOLVED] Postfix Connection failure (outbound)?，看起來是CentOS 6才有問題，修改了vim /etc/postfix/main.cf裡頭的資訊

vim /etc/postfix/main.cf
inet_interfaces = all //原設定為localhost
inet_protocols = ipv4 //原設定為all

重新啟動即可

/sbin/service postfix restart

參考網址：
[SOLVED] Postfix Connection failure (outbound)?