diff --git a/bin/export.bash b/bin/export.bash
index 577d676..6bd6308 100755
--- a/bin/export.bash
+++ b/bin/export.bash
@@ -24,8 +24,14 @@ function export_files {
     tar -C / -cf "$temp_dir/files.tar" etc/sympa/sympa/sympa.conf
     tar -C / -uf "$temp_dir/files.tar" etc/sympa/data_structure.version
     tar -C / -uf "$temp_dir/files.tar" etc/sympa/auth.conf
+    
     tar -C / -uf "$temp_dir/files.tar" var/lib/sympa
     tar -C / -uf "$temp_dir/files.tar" var/spool/sympa
+
+    tar -C / -uf "$temp_dir/files.tar" etc/postfix/main.cf
+    tar -C / -uf "$temp_dir/files.tar" etc/dkimkeys/mail.private
+    tar -C / -uf "$temp_dir/files.tar" etc/letsencrypt
+
     gzip "$temp_dir/files.tar"
 }
 
diff --git a/bin/import.bash b/bin/import.bash
index bebac5a..048309a 100755
--- a/bin/import.bash
+++ b/bin/import.bash
@@ -63,16 +63,23 @@ function import_files_etc {
 	replace_conf_entry_from_export lang	
 }
 
-function import_files_lib {
+function import_files_sympa_lib {
 	rm -rf /var/lib/sympa
 	mv var/lib/sympa /var/lib
 }
 
-function import_files_spool {
+function import_files_sympa_spool {
 	rm -rf /var/spool/sympa
 	mv var/spool/sympa /var/spool
 }
 
+function import_files_postfix {
+	mv etc/postfix/main.cf /etc/postfix/
+	mv etc/dkimkeys/mail.private /etc/dkimkeys/
+
+	rm -rf /etc/letsencrypt
+	mv etc/letsencrypt /etc
+}
 
 function import_files {
 	echo -n "import files..."
@@ -82,8 +89,9 @@ function import_files {
 	
 	tar -xf "$export_tmp/files.tar.gz"
 	import_files_etc
-	import_files_lib
-	import_files_spool
+	import_files_sympa_lib
+	import_files_sympa_spool
+	import_files_postfix
 
 	echo OK
 }
diff --git a/debian/install.bash b/debian/install.bash
index ed622cc..507c1a7 100755
--- a/debian/install.bash
+++ b/debian/install.bash
@@ -5,4 +5,6 @@
 # execute as root or use `sudo`
 [[ $(id -u) != 0 ]] && exec sudo $(dirname "$0")/$(basename "$0")
 
-echo TODO...
\ No newline at end of file
+apt install -y postfix postgresql nginx fcgiwrap perl-doc certbot
+
+echo TO BE continued...
\ No newline at end of file