How to send an email that can't be opened?

I cant send an email to a yahoo email address?

y cant i send an email to a yahoo email address, when i send it, a few mins later the mailer daemon says that its not a real email address. howeva i talked to this contact on yahoo messenger! y is this happening, whats causing it? how to i fix this? please help me thank you for taking ur time to answer my question
Answer:

it a long list. click on a link below http://help.yahoo.com/l/us/yahoo/mail/yahoomail/commonissues/common-03.html;_ylt=Aiok_P3jHkjq7JH6Enl_lrYI4SV4

England at Yahoo! Answers Visit the source

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