diff --git a/conf/main_ipv4.conf.sample b/conf/main_ipv4.conf.sample
index 0012dc7..667026b 100644
--- a/conf/main_ipv4.conf.sample
+++ b/conf/main_ipv4.conf.sample
@@ -837,6 +837,13 @@ mail_user_ports="$standard_mailuser_ports"
 mail_smtp_port="$standard_smtp_port"
 
 
+# Additional Ports for outgoing smtp traffic
+#
+# comma separated list of ports
+#
+smtpd_additional_outgoung_ports=""
+
+
 # ======
 # - FTP Service
 # ======
diff --git a/conf/main_ipv6.conf.sample b/conf/main_ipv6.conf.sample
index 1af9a12..be24a3d 100644
--- a/conf/main_ipv6.conf.sample
+++ b/conf/main_ipv6.conf.sample
@@ -809,6 +809,13 @@ mail_user_ports="$standard_mailuser_ports"
 mail_smtp_port="$standard_smtp_port"
 
 
+# Additional Ports for outgoing smtp traffic
+#
+# comma separated list of ports
+#
+smtpd_additional_outgoung_ports=""
+
+
 # ======
 # - FTP Service
 # ======
diff --git a/conf/post_decalrations.conf b/conf/post_decalrations.conf
index 81c0f27..52b62ec 100644
--- a/conf/post_decalrations.conf
+++ b/conf/post_decalrations.conf
@@ -727,6 +727,27 @@ done
 IFS="$CUR_IFS"
 
 
+# ---
+# Additional SMTP Outgoing Ports
+# ---
+declare -a smtpd_additional_outgoung_port_arr=()
+CUR_IFS="$IFS"
+IFS=',' ; for _port in $smtpd_additional_outgoung_ports ; do
+
+   if containsElement "${_port}" "${out_tcp_port_arr[@]}" ; then
+      continue
+   fi
+
+   smtpd_additional_outgoung_port_arr+=("${_port}")
+
+   if $allow_mail_request_out ; then
+      out_tcp_port_arr+=("$_port")
+   fi
+
+done
+IFS="$CUR_IFS"
+
+
 
 # ---
 # - FTP out only
diff --git a/ip6t-firewall-gateway b/ip6t-firewall-gateway
index 2c6f335..fda33de 100755
--- a/ip6t-firewall-gateway
+++ b/ip6t-firewall-gateway
@@ -2630,6 +2630,29 @@ else
 fi
 
 
+# ---
+# - Mail (additional smtp ports OUT)
+# ---
+
+echononl "\t\tMail (additional smtp ports OUT)"
+
+if [[ ${#smtpd_additional_outgoung_port_arr[@]} -gt 0 ]] ; then
+
+   for _port in ${smtpd_additional_outgoung_port_arr[@]} ; do
+      for _dev in ${ext_if_arr[@]} ; do
+         $ip6t -A OUTPUT -o $_dev -p tcp --dport $_port -m state --state NEW -j ACCEPT
+         if $kernel_forward_between_interfaces ; then
+            $ip6t -A FORWARD -o $_dev -p tcp --dport $_port -m state --state NEW -j ACCEPT
+         fi
+      done
+   done
+
+   echo_done
+else
+   echo_skipped
+fi
+
+
 # ---
 # - SMTP (Relay) Service Gateway
 # ---
diff --git a/ipt-firewall-gateway b/ipt-firewall-gateway
index 0cea726..35075ff 100755
--- a/ipt-firewall-gateway
+++ b/ipt-firewall-gateway
@@ -3402,6 +3402,29 @@ else
 fi
 
 
+# ---
+# - Mail (additional smtp ports OUT)
+# ---
+
+echononl "\t\tMail (additional smtp ports OUT)"
+
+if [[ ${#smtpd_additional_outgoung_port_arr[@]} -gt 0 ]] ; then
+
+   for _port in ${smtpd_additional_outgoung_port_arr[@]} ; do
+      for _dev in ${ext_if_arr[@]} ; do
+         $ipt -A OUTPUT -o $_dev -p tcp --dport $_port -m state --state NEW -j ACCEPT
+         if $kernel_activate_forwarding ; then
+            $ipt -A FORWARD -o $_dev -p tcp --dport $_port -m state --state NEW -j ACCEPT
+         fi
+      done
+   done
+
+   echo_done
+else
+   echo_skipped
+fi
+
+
 # ---
 # - SMTP (Relay) Service Gateway
 # ---