make rmail command available

exim/exim.spec

@@ -133,6 +133,7 @@ Provides:     MTA
     ( cd $RPM_BUILD_ROOT%{l_prefix}/sbin
       ln -s ../bin/exim sendmail
       ln -s ../bin/exim mailq
+      ln -s ../bin/exim rmail
     )
     ( echo "#!/bin/sh"
       echo "%{l_prefix}/sbin/sendmail -bi"