diff --git a/src/freedombone-base-email b/src/freedombone-base-email
index c85f22ff..5938a044 100755
--- a/src/freedombone-base-email
+++ b/src/freedombone-base-email
@@ -837,7 +837,9 @@ function install_email {
     chmod 640 /etc/exim4/exim.key /etc/exim4/exim.crt /etc/exim4/exim.dhparam
 
     sed -i '/login_saslauthd_server/,/.endif/ s/# *//' /etc/exim4/exim4.conf.template
-    sed -i "/.ifdef MAIN_HARDCODE_PRIMARY_HOSTNAME/i\MAIN_HARDCODE_PRIMARY_HOSTNAME = $DEFAULT_DOMAIN_NAME\nMAIN_TLS_ENABLE = true" /etc/exim4/exim4.conf.template
+    if ! grep -q "MAIN_TLS_ENABLE = true" /etc/exim4/exim4.conf.template; then
+        sed -i "/.ifdef MAIN_HARDCODE_PRIMARY_HOSTNAME/i\MAIN_HARDCODE_PRIMARY_HOSTNAME = $DEFAULT_DOMAIN_NAME\nMAIN_TLS_ENABLE = true" /etc/exim4/exim4.conf.template
+    fi
     sed -i "s|SMTPLISTENEROPTIONS=''|SMTPLISTENEROPTIONS='-oX 465:25:587 -oP /var/run/exim4/exim.pid'|g" /etc/default/exim4
     if ! grep -q "tls_on_connect_ports=465" /etc/exim4/exim4.conf.template; then
         sed -i '/SSL configuration for exim/i\tls_on_connect_ports=465' /etc/exim4/exim4.conf.template