(keitai-l) What's the mobile email protocol for the carriers in Japan?

 

Dear all: 

I am a new comer here, now I have some questions about the Japan mobile
market. 

One of them is about the mobile email system. 

I know for DoCoMo, 2G network is PDC, 3G is WCDMA 

For KDDI Au, 3G is CDMA2000. 

For Softbank, 3G is also WCDMA. 

So how these carriers set up the mobile email systems in their networks? 

and who is the mobile spam solution provider for them? 

Looking forward to your reply! 

Thanks!

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