Help with yahoo mail server error 521

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Yahoo mail server error 521 HELP NEEDED!!!!
If there is anyone out there that could help me with this situation, it would be greatly appreciated. I am having trouble with the yahoo mail server in the process of sending out a bulk e-mail newsletter. I have the problem so that when I send my mail, the first 200 or so send and the rest are not. Then, the yahoo server sends back the message that there is an error coded 521 for the mishap. If anyone out there could help me, contact me at via email at


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