Netease Mail server's IPs are:
    202.106.186.34
    202.108.36.[195-254]
    202.108.5.[1-254]
    202.108.9.[128-254]
    220.181.12.[1-254]
    220.181.13.[1-254]
    220.181.14.[1-254]
    220.181.15.[1-254]
    220.181.28.149
　　220.181.31.[1-254]
    202.108.16.25
    202.108.16.26
    60.191.85.[1-254]
    60.12.227.[129-158]
    220.232.228.[74-78]
    220.181.72.[200-254]
    123.125.50.[1-254]
    Netease Mail's domains include:163.com,126.com,188.com,vip.163.com,yeah.net,netease.com, corp.netease.com,service.netease.com
    Please note that:All these domains are possibly crossing among several IP ranges.There are not strict mapping between IPs and domains.