Disable email chunking on upgrades

src/freedombone-upgrade

@@ -95,6 +95,7 @@ if [ -d $PROJECT_DIR ]; then
 
         apt-get -yq -t stretch-backports install certbot
         email_install_tls
+        email_disable_chunking
         defrag_filesystem
     fi
 fi

src/freedombone-utils-web

@@ -983,6 +983,16 @@ function install_composer {
     fi
 }
 
+function email_disable_chunking {
+    if [ -f /etc/exim4/conf.d/main/04_exim4-config_chunking ]; then
+        return
+    fi
+    echo "chunking_advertise_hosts =" > /etc/exim4/conf.d/main/04_exim4-config_chunking
+    update-exim4.conf
+    dpkg-reconfigure --frontend noninteractive exim4-config
+    systemctl restart exim4
+}
+
 function email_install_tls {
     tls_config_file=/etc/exim4/conf.d/main/03_exim4-config_tlsoptions
     tls_auth_config_file=/etc/exim4/conf.d/auth/30_exim4-config_examples