diff -ru smf-spf-2.5.1/smf-spf.conf smf-spf-2.5.1.new/smf-spf.conf
--- smf-spf-2.5.1/smf-spf.conf	2020-11-12 22:44:54.000000000 +0100
+++ smf-spf-2.5.1.new/smf-spf.conf	2020-11-19 17:30:29.959048072 +0100
@@ -103,6 +103,7 @@
 # Default: on
 #
 #RefuseFail	on	# (on|off)
+RefuseFail	off
 
 # When refusing e-Mail messages use a 450 SMTP code
 #