# Attempt to support Kerberos
#### Patch data follows ####
--- a/sendmail/conf.c
+++ b/sendmail/conf.c
@@ -3986,6 +3986,13 @@ void
 vendor_post_defaults(e)
 	ENVELOPE *e;
 {
+	/*
+	 * Kerberos V support
+	 */
+	sm_setuserenv("KRB5CCNAME", NULL);
+	sm_setuserenv("KRB5_KTNAME", NULL);
+	sm_setuserenv("KRB5_CONFIG", NULL);
+
 #ifdef __QNX__
 	/* Makes sure the SOCK environment variable remains */
 	sm_setuserenv("SOCK", NULL);