diff --git a/conf/main_ipv4.conf.sample b/conf/main_ipv4.conf.sample
index e20e099..63989a3 100644
--- a/conf/main_ipv4.conf.sample
+++ b/conf/main_ipv4.conf.sample
@@ -409,6 +409,11 @@ http_ports="$standard_http_ports"
 # - Mail Services
 # ======
 
+# - SMTP server (i.e. mail relay service) Gateway
+# -
+local_smtp_service=false
+
+
 # - Mailserver (SMTP(POP/IMAP) Gateway
 # -
 # - NOT YET IMPLEMENTED
diff --git a/conf/main_ipv6.conf.sample b/conf/main_ipv6.conf.sample
index 5dfb10f..edde3b6 100644
--- a/conf/main_ipv6.conf.sample
+++ b/conf/main_ipv6.conf.sample
@@ -392,6 +392,11 @@ http_ports="$standard_http_ports"
 # - Mail Services
 # ======
 
+# - SMTP server (i.e. mail relay service) Gateway
+# -
+local_smtp_service=false
+
+
 # - Mailserver (SMTP(POP/IMAP) Gateway
 # -
 # - NOT YET IMPLEMENTED
diff --git a/ip6t-firewall-gateway b/ip6t-firewall-gateway
index 7e97aa6..8a4f795 100755
--- a/ip6t-firewall-gateway
+++ b/ip6t-firewall-gateway
@@ -1651,6 +1651,22 @@ else
 fi
 
 
+# ---
+# - SMTP (Relay) Service Gateway
+# ---
+
+echononl "\t\tSMTP (Relay) Service Gateway (only on local network)"
+if $local_smtp_service ; then
+   for _dev in ${local_if_arr[@]} ; do
+      $ip6t -A INPUT -p tcp -i $_dev --dport $standard_smtp_port -m conntrack --ctstate NEW -j ACCEPT
+   done
+
+   echo_done
+else
+   echo_skipped
+fi
+
+
 # ---
 # - Mail User Services smtps/pop(s)/imap(s) only out
 # ---
diff --git a/ipt-firewall-gateway b/ipt-firewall-gateway
index fe6d679..dd99dab 100755
--- a/ipt-firewall-gateway
+++ b/ipt-firewall-gateway
@@ -2074,6 +2074,23 @@ else
 fi
 
 
+# ---
+# - SMTP (Relay) Service Gateway
+# ---
+
+echononl "\t\tSMTP (Relay) Service Gateway (only on local network)"
+if $local_smtp_service ; then
+   for _dev in ${local_if_arr[@]} ; do
+      $ipt -A INPUT -p tcp -i $_dev --dport $standard_smtp_port -m conntrack --ctstate NEW -j ACCEPT
+   done
+
+   echo_done
+else
+   echo_skipped
+fi
+   
+
+
 # ---
 # - Mail User Services smtps/pop(s)/imap(s) only out
 # ---