由于众所周知的原因， google无法访问， 一直使用的smarthost也无法工作， 简单一些还可以通过IP地址来访问， 可以通过如下方式来寻找相应的IP地址：
1， 使用公共的web ping工具找到Google.com ip；
工具有不少，如StartPing或APM Cloud Monitor， 输入Google.com, 得出如下结果，
Region Country City Result min. rrt avg. rrt max. rrt IP Europe Italy Milan Ok 0.2 0.3 0.3 173.194.116.4 Europe Latvia Riga Ok 10.4 10.5 10.6 173.194.32.33 Europe Lithuania Siauliai Ok 3.2 3.2 3.3 84.15.64.37 North America United States Philadelphia Ok 0.2 0.2 0.2 <span style="color:#ff0000;">4.31.115.251</span> North America United States Phoenix Ok 21.4 21.5 21.6 74.125.224.98 North America United States Piscataway Ok 1.4 1.5 1.5 74.125.226.38 North America United States Portland Ok 3.8 4.2 4.9 173.194.33.99 North America United States Sacramento Ok 0.9 1 1.3 74.125.224.167 North America United States Salem Ok 21.1 21.4 21.8 74.125.22.113 North America United States Salt Lake City Ok 18.9 18.9 19 74.125.224.65 North America United States San Antonio Ok 37.2 37.4 38.2 173.194.115.104 North America United States San Diego Ok 14.8 14.8 14.9 74.125.239.130 North America United States San Francisco Ok 2.3 2.3 2.4 74.125.239.39 North America United States San Jose Ok 1.5 1.7 2.8 74.125.239.133 North America United States Seattle Ok 0.5 0.6 0.8 173.194.33.32 North America United States South Bend Ok 3.5 3.6 3.6 74.125.225.33 North America United States St Louis Ok 13.8 13.8 13.9 74.125.225.0 North America United States Tampa Ok 12.2 12.2 12.2 74.125.196.100 North America United States Toledo Ok 8.6 8.8 9.1 74.125.225.96 North America United States Washington Ok 2.2 2.3 2.8 74.125.228.4 South America Argentina Buenos Aires Ok 2 3 5.5 173.194.42.69 South America Brazil Joao Pessoa Ok 2.7 2.8 3.2 177.159.237.30 South America Brazil Sao Paulo Ok 147.3 147.4 147.4 74.125.226.41 South America Chile Santiago Ok 2 2 2 64.233.186.100
2， 找到可用IP， 最简单（笨）的方法将最后一列中的IP地址逐个直接输入浏览器， 下面就是找到一些可用的，
4.31.115.251 （亲测可用, 2014.08.18）
173.194.13.13 （亲测可用, 2014.08.18）
等。
ps：下面是一些其他的方法可供参考：