Reverted last change for a better fix:

	* gnus-sum.el (gnus-ignored-from-addresses): Handle case where
	user-mail-name is an empty string.

lisp/gnus/ChangeLog

 2005-10-23  Chong Yidong  <cyd@stupidchicken.com>
 
-	* gnus-sum.el (gnus-summary-from-or-to-or-newsgroups): Handle case
-	where gnus-ignored-from-address is an empty string.
+	* gnus-sum.el (gnus-ignored-from-addresses): Handle case where
+	user-mail-name is an empty string.
 
 2005-10-20  Hiroshi Fujishima  <hiroshi.fujishima@gmail.com>  (tiny change)
 

lisp/gnus/gnus-sum.el

@@ -1000,7 +1000,9 @@ which it may alter in any way."
   :type '(repeat symbol))
 
 (defcustom gnus-ignored-from-addresses
-  (and user-mail-address (regexp-quote user-mail-address))
+  (and user-mail-address  
+       (not (string= user-mail-address ""))
+       (regexp-quote user-mail-address))
   "*Regexp of From headers that may be suppressed in favor of To headers."
   :version "21.1"
   :group 'gnus-summary
@@ -3304,7 +3306,6 @@ buffer that was in action when the last article was fetched."
 			 gnus-newsgroup-ignored-charsets)))
     (or
      (and gnus-ignored-from-addresses
-	  (not (string= gnus-ignored-from-addresses ""))
 	  (string-match gnus-ignored-from-addresses gnus-tmp-from)
 	  (let ((extra-headers (mail-header-extra header))
 		to