message. The function should return a list of group names that it
thinks should carry this mail message.
-This variable can also be a fancy split method. See @xref{Fancy Mail
-Splitting} for the syntax.
+This variable can also be a fancy split method. For the syntax,
+@pxref{Fancy Mail Splitting}.
Note that the mail back ends are free to maul the poor, innocent,
incoming headers all they want to. They all add @code{Lines} headers;