Index: opendkim/opendkim.c
===================================================================
RCS file: /cvsroot/opendkim/opendkim/opendkim.c,v
retrieving revision 1.225
diff -u -r1.225 opendkim.c
--- opendkim/opendkim.c	14 Oct 2010 18:15:49 -0000	1.225
+++ opendkim/opendkim.c	22 Oct 2010 20:49:02 -0000
@@ -9272,6 +9272,7 @@
 		return SMFIS_CONTINUE;
 	}
 	strlcpy(dfc->mctx_domain, domain, sizeof dfc->mctx_domain);
+	dkimf_lowercase(dfc->mctx_domain);
 
 	/* if it's exempt, bail out */
 	if (conf->conf_exemptdb != NULL)