--- gnus-art.el	2005-11-28 09:37:06.000000000 -0500
+++ gnus-art.el.new	2005-12-01 12:51:02.000000000 -0500
@@ -2494,7 +2494,9 @@
       (goto-char (point-min))
       (while (re-search-forward
 	      "\\(\\(https?\\|ftp\\)://\\S-+\\) *\n\\(\\S-+\\)" nil t)
-	(replace-match "\\1\\3" t)))
+        (if (save-match-data
+              (not (string-match "^\\(https?\\|ftp\\):" (match-string 3))))
+            (replace-match "\\1\\3" t))))
     (when (interactive-p)
       (gnus-treat-article nil))))