Index: lisp/mail-source.el
===================================================================
RCS file: /usr/local/cvsroot/gnus/lisp/mail-source.el,v
retrieving revision 7.24
diff -u -r7.24 mail-source.el
--- lisp/mail-source.el	16 Dec 2007 04:23:18 -0000	7.24
+++ lisp/mail-source.el	1 Jan 2008 17:12:10 -0000
@@ -74,6 +74,8 @@
 	  (repeat :tag "List"
 	   (choice :format "%[Value Menu%] %v"
 		   :value (file)
+		   (cons :tag "Group parameter `mail-source'"
+			 (const :format "" group))
 		   (cons :tag "Spool file"
 			 (const :format "" file)
 			 (checklist :tag "Options" :greedy t
Index: lisp/nnmail.el
===================================================================
RCS file: /usr/local/cvsroot/gnus/lisp/nnmail.el,v
retrieving revision 7.38
diff -u -r7.38 nnmail.el
--- lisp/nnmail.el	16 Dec 2007 04:23:18 -0000	7.38
+++ lisp/nnmail.el	1 Jan 2008 17:12:11 -0000
@@ -1766,11 +1766,15 @@
       (symbol-value sym))))
 
 (defun nnmail-get-new-mail (method exit-func temp
-				   &optional group spool-func)
+			    &optional group spool-func)
   "Read new incoming mail."
+  (nnmail-get-new-mail-1 method exit-func temp group nil spool-func))
+
+(defun nnmail-get-new-mail-1 (method exit-func temp
+			      group in-group spool-func)
+
   (let* ((sources mail-sources)
 	 fetching-sources
-	 (group-in group)
 	 (i 0)
 	 (new 0)
 	 (total 0)
@@ -1778,6 +1782,16 @@
     (when (and (nnmail-get-value "%s-get-new-mail" method)
 	       sources)
       (while (setq source (pop sources))
+
+	;; Use group's parameter
+	(when (eq (car source) 'group)
+	  (let ((mail-sources
+		 (list
+		  (gnus-group-find-parameter (concat (symbol-name method) ":" group)
+					     'mail-source t))))
+	    (nnmail-get-new-mail-1 method exit-func temp group group spool-func))
+	  (setq source nil))
+	  
 	;; Hack to only fetch the contents of a single group's spool file.
 	(when (and (eq (car source) 'directory)
 		   (null nnmail-scan-directory-mail-source-once)
@@ -1816,9 +1830,10 @@
 			 (nnmail-split-incoming
 			  file ',(intern (format "%s-save-mail" method))
 			  ',spool-func
-			  (if (equal file orig-file)
-			      nil
-			    (nnmail-get-split-group orig-file ',source))
+			  (or in-group
+			      (if (equal file orig-file)
+				  nil
+				(nnmail-get-split-group orig-file ',source)))
 			  ',(intern (format "%s-active-number" method)))))))
 	  (incf total new)
 	  (incf i)))
Index: texi/gnus.texi
===================================================================
RCS file: /usr/local/cvsroot/gnus/texi/gnus.texi,v
retrieving revision 7.267
diff -u -r7.267 gnus.texi
--- texi/gnus.texi	28 Dec 2007 22:28:04 -0000	7.267
+++ texi/gnus.texi	1 Jan 2008 17:12:16 -0000
@@ -3035,6 +3035,12 @@
 If it is set, the value is used as the method for posting message
 instead of @code{gnus-post-method}.
 
+@item mail-source
+@cindex mail-source
+If it is set, and the setting of @code{mail-sources} includes a
+@code{group} mail source (@pxref{Mail Sources}), the value specifies the
+mail source for this group.
+
 @item banner
 @cindex banner
 An item like @code{(banner . @var{regexp})} causes any part of an article
@@ -14546,6 +14552,11 @@
          :user "user-name"
          :password "secret")
 @end lisp
+
+@item group
+Get the actual mail source from the @code{mail-source} group parameter,
+@xref{Group Parameters}.
+
 @end table
 
 @table @dfn