QQ mail: 550 Suspected spam ip

qq mail: 550 Suspected spam ip
mail blocked by theIP

http://service.mail.qq.com/cgi-bin/help?subtype=1&&id=20022&&no=1001495
550 Suspected spam ip.
IP 发送大量垃圾邮件，或所发送的邮件收件人存在大量的不存在账号。

Basically It is nothing Service Provide can do, need user to set mail setting.

Solution:
Add domain into whitelist.
Setting》Spam》Set Email whitelist
Setting》Spam》Set domain whitelist
把被拒邮箱的网域加入白名单。
设置》反垃圾》设置邮件地址白名单
设置》反垃圾》设置域名白名单