Change default domain if needed

src/freedombone-base-email

     sed -i '/login_saslauthd_server/,/.endif/ s/# *//' /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
+    else
+        sed -i "s|MAIN_HARDCODE_PRIMARY_HOSTNAME =.*|MAIN_HARDCODE_PRIMARY_HOSTNAME = $DEFAULT_DOMAIN_NAME|g" /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