reduce to experimental because it was never tested in detail

exim/exim.spec

@@ -29,7 +29,7 @@ Summary:      Exim Mail Transfer Agent
 URL:          http://www.exim.org/
 Vendor:       Philip Hazel
 Packager:     The OpenPKG Project
-Distribution: OpenPKG [REL]
+Distribution: OpenPKG [EXP]
 Group:        Mail
 License:      GPL
 Version:      3.33