You're using the SSL port without telling MIME::Lite to use SSL, and you don't appear to be using the the correct host name.

From http://help.yahoo.com/l/us/yahoo/mail/original/mailplus/pop/pop-14.html,

• SMTP server: plus.smtp.mail.yahoo.com
• Use SSL
• Port: 465
• Use authentication
• Account Name/Login Name: Your Yahoo! Mail ID (your email address without the "@yahoo.com", for example, “testing80”)
• Email Address: Your Yahoo! Mail address (for example, testing80@yahoo.com)
• Password: Your Yahoo! Mail password

Update: I swear I saw an Ssl => 1 option when I looked at the docs, but there isn't. I must have been looking at the wrong window. Later posts seem to indicate that SSL is automatically detected.

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