rebuild exim on upgrades

src/freedombone-base-email

 exim_version='4.89'
 
 function rebuild_exim_with_socks {
+    exim_socks_installed=$(get_completion_param "exim_socks")
+    if [[ "$exim_socks_installed" == 'true' ]]; then
+        return
+    fi
+
     # shellcheck disable=SC2154
     if [ ! -d "$INSTALL_DIR" ]; then
         mkdir -p "$INSTALL_DIR/exim4"
     dpkg -i exim4_${exim_version}_all.deb
     apt-mark -q hold exim4
     apt-get -yq remove --purge at
+
+    systemctl restart exim4
+    if [[ $(systemctl is-active exim4) != 'active' ]]; then
+        apt-mark -q unhold exim4
+        apt-get -yq install exim4 --reinstall
+        systemctl restart exim4
+    fi
+
+    rm -rf "$INSTALL_DIR/exim4"
+
+    set_completion_param "exim_socks" "true"
 }
 
 function email_create_template {

src/freedombone-upgrade

             exit 453536
         fi
 
+        rebuild_exim_with_socks
         apt-get -yq -t stretch-backports install certbot
         email_install_tls
         email_disable_chunking