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Wu XiaoGuang <woohsiaokuang@yahoo.com.cn> writes:

> 530 authentication required - for help go to http://help.yahoo.com/help/us/mail/pop/pop-11.html

You need a newer smtpmail.el that supports authentication, try
retrieving the one from Emacs CVS

http://savannah.gnu.org/cgi-bin/viewcvs/*checkout*/emacs/emacs/lisp/mail/smtpmail.el?rev=1.45

and read the comments.