+diff -urNp -x '*.orig' postfix-3.8.1.org/src/global/mail_params.h postfix-3.8.1/src/global/mail_params.h
+--- postfix-3.8.1.org/src/global/mail_params.h 2023-07-09 22:19:21.003024104 +0200
++++ postfix-3.8.1/src/global/mail_params.h 2023-07-09 22:19:21.172026512 +0200
+@@ -4411,6 +4411,13 @@ extern bool var_ign_srv_lookup_err;
+ #define DEF_ALLOW_SRV_FALLBACK 0
+ extern bool var_allow_srv_fallback;
+
++ /*
++ * SMTPD messages
++ */
++#define VAR_REJECT_REPLY_MSG_ACCESS_DENIED "smtpd_reject_msg_access_denied"
++#define DEF_REJECT_REPLY_MSG_ACCESS_DENIED "rejected: Relay access denied."
++extern char *var_reject_reply_msg_access_denied;
++
+ /* LICENSE
+ /* .ad
+ /* .fi
+diff -urNp -x '*.orig' postfix-3.8.1.org/src/smtpd/smtpd.c postfix-3.8.1/src/smtpd/smtpd.c
+--- postfix-3.8.1.org/src/smtpd/smtpd.c 2023-06-05 21:06:51.000000000 +0200
++++ postfix-3.8.1/src/smtpd/smtpd.c 2023-07-09 22:19:21.173026526 +0200
+@@ -6645,6 +6645,7 @@ int main(int argc, char **argv)
+ VAR_MILT_MACRO_DEFLTS, DEF_MILT_MACRO_DEFLTS, &var_milt_macro_deflts, 0, 0,
+ VAR_SMTPD_MILTER_MAPS, DEF_SMTPD_MILTER_MAPS, &var_smtpd_milter_maps, 0, 0,
+ VAR_STRESS, DEF_STRESS, &var_stress, 0, 0,
++ VAR_REJECT_REPLY_MSG_ACCESS_DENIED, DEF_REJECT_REPLY_MSG_ACCESS_DENIED, &var_reject_reply_msg_access_denied, 1, 0,
+ VAR_UNV_FROM_WHY, DEF_UNV_FROM_WHY, &var_unv_from_why, 0, 0,
+ VAR_UNV_RCPT_WHY, DEF_UNV_RCPT_WHY, &var_unv_rcpt_why, 0, 0,
+ VAR_REJECT_TMPF_ACT, DEF_REJECT_TMPF_ACT, &var_reject_tmpf_act, 1, 0,