Connection to the remote recipient's server was denied for unknown reason

[John Hunter]

Hi,
I was trying to send some patches using git send email, but I got the error
msg:
"Connection to the remote recipient's server was denied for unknown reason"
Can anybody help?

-- 
Best regards
Junwang Zhao
Microprocessor Research and Develop Center
Department of Computer Science &Technology
Peking University
Beijing, 100871, PRC
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