Actually this is the most common issue (link below) and it happens in all countries. 
 Basically your account has been compromised (or someone has attempted to access 
it with the wrong info to many times) or you are sending email that looks to them 
as if it may be spam:

http://sg.answers.yahoo.com/question/index?qid=20080202205127AALPgd7

Google it and you will see that you aren't alone...







On Thursday, February 14, 2008 at 12:53 pm, Joe S wrote:

>Have used Yahoo e-mail for a long time. Suddenly i get a message that reads "Unusual 

>Activity Detected" and it shuts off use of nthe e-mail for up to 48 hours. I have 

>run all my security programs and can find nothing wrong. Has anyone else experienced 

>this problem.  I have sent them a request to by pass this feature of their service 

>if possible but haven't heard back from them as yet. Of course I will not be able 

>to recieve an e-mail until ythey turn me on again so I will just check back here 

>periodicall to see if any response have been made..  Thanx 

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