can't send/receive yahoo.com

I have a few dedicated servers, but we can't send/receive any emails to yahoo.com domain? We're being blocked or something. How can we resolve the problems?

It's been for a few days already and the problems have been known to my clients and they've started complaining. If we can't solve the problem, I guess I have no choice but to move to a different provider.

So your advices are much appreciated.

 

 

 

 

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