unknown sender

[mezzenger]

I have installed the latest emacs and set up email using vm.  I can send and 
receive email, but the "from" field is blank in mail received from me.  I need 
to know where the from field is set.

Here is the email portion of my dot emacs file:

-----------------------------------------------------------------------------------------------
;; Mail
;; SMTP
(setq send-mail-function 'smtpmail-send-it)
(setq smtpmail-smtp-server "smtp.comcast.net")
(setq smtpmail-smtp-service 587)
(setq smtpmail-auth-credentials
           '(("smtp.comcast.net" 587 "my_username" "my_password")))
(setq user-mail-address "mezzenger@comcast.net")
(setq user-full-name "Alvin Smith")
(setq mail-default-reply-to "mezzenger@comcast.net)

;;POP3
(setq vm-pop-folder-alist
      '(
        ("pop:mail.comcast.net:110:pass:my_username:my_password" "Comcast")
      )) 

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What am I missing?
Thanks.