diff --git a/conf/config.php b/conf/config.php
index 9c15695..6c8737d 100644
--- a/conf/config.php
+++ b/conf/config.php
@@ -145,8 +145,8 @@
 	// Hostname:port combination to send outgoing mail (i.e. localhost:25). 
 	// Blank - use system MTA.
 	
-	putenv('TTRSS_SMTP_LOGIN=');
-	putenv('TTRSS_SMTP_PASSWORD=');
+	putenv('TTRSS_SMTP_LOGIN=__APP__');
+	putenv('TTRSS_SMTP_PASSWORD=__MAIL_PWD__');
 	// These two options enable SMTP authentication when sending
 	// outgoing mail. Only used with SMTP_SERVER.
 
diff --git a/conf/migration b/conf/migration
deleted file mode 100644
index 15e836d..0000000
--- a/conf/migration
+++ /dev/null
@@ -1,30 +0,0 @@
-# OPML import/export (including filters and some settings). Must be done before data_migration plugin if you want to keep feed categories
-
-# on the original machine
-sudo mkdir /var/www/tt-rss/export
-sudo chown -R www-data:www-data /var/www/tt-rss/export/
-sudo -u www-data php /var/www/tt-rss/update.php --opml-export "MYUSERNAME /var/www/tt-rss/export/export-2020-08-07.opml" # export feeds OPML
-# on a client
-rsync -avP my.original.machine.org:/var/www/tt-rss/export/export-2020-08-07.opml ./ # download opml export
-# login to the new tt-rss instance from a browser, go to Preferences > Feeds, import OPML file
-
-# migrate all articles from mysql to postgresql
-# on the original machine
-git clone https://git.tt-rss.org/fox/ttrss-data-migration
-sudo chown -R root:www-data ttrss-data-migration/
-sudo mv ttrss-data-migration/ /var/www/tt-rss/plugins.local/data_migration
-sudo nano /var/www/tt-rss/config.php # enable data_migration in the PLUGINS array
-sudo -u www-data php /var/www/tt-rss/update.php --data_user MYUSERNAME --data_export /var/www/tt-rss/export/export-2020-08-07.zip # export articles to database-agnostic format
-
-# on the target machine
-git clone https://git.tt-rss.org/fox/ttrss-data-migration
-sudo chown -R root:www-data ttrss-data-migration/
-sudo mv ttrss-data-migration/ /var/www/rss.example.org/plugins.local/data_migration
-sudo nano /var/www/rss.example.org/config.php # enable data_migration in the PLUGINS array
-rsync -avP my.original.machine.org:/var/www/tt-rss/export/export-2020-08-07.zip ./
-sudo mkdir /var/www/rss.example.org/export
-sudo mv export-2020-08-07.zip /var/www/rss.example.org/export
-sudo chown -R root:www-data /var/www/rss.example.org/export
-sudo chmod -R g+rX /var/www/rss.example.org/export/
-sudo -u www-data php /var/www/rss.example.org/update.php --data_user MYUSERNAME --data_import /var/www/rss.example.org/export/export-2020-08-07.zip # it can take a while
-sudo rm -r /var/www/rss.example.org/export/ # cleanup
\ No newline at end of file
diff --git a/manifest.toml b/manifest.toml
index 244f141..5ace8a8 100644
--- a/manifest.toml
+++ b/manifest.toml
@@ -47,6 +47,7 @@ ram.runtime = "50M"
         sha256 = "72ec560bd5ad7bac4789d7af0e5c2d7c1c394e9c540d46d5421ecae219d8f875"
 
     [resources.system_user]
+    allow_email = true
 
     [resources.install_dir]
 
diff --git a/scripts/change_url b/scripts/change_url
index 2bccdeb..fb1351f 100644
--- a/scripts/change_url
+++ b/scripts/change_url
@@ -34,7 +34,7 @@ ynh_script_progression --message="Updating a configuration file..." --weight=1
 
 domain_path="https://${new_domain}${new_path}"
 domain="$new_domain"
-ynh_add_config --template="../conf/config.php" --destination="$install_dir/config.php"
+ynh_add_config --template="config.php" --destination="$install_dir/config.php"
 
 chmod 400 "$install_dir/config.php"
 chown $app "$install_dir/config.php"
diff --git a/scripts/install b/scripts/install
index 0066e6c..9303b62 100644
--- a/scripts/install
+++ b/scripts/install
@@ -16,7 +16,6 @@ ynh_script_progression --message="Setting up source files..." --weight=7
 
 # Download, check integrity, uncompress and patch the source from app.src
 ynh_setup_source --dest_dir="$install_dir"
-#ynh_setup_source --dest_dir="$install_dir/plugins.local/data_migration" --source_id="data_migration"
 echo "$(ynh_app_upstream_version)" > "$install_dir/version_static.txt"
 
 chmod -R o-rwx "$install_dir"
@@ -47,7 +46,7 @@ ynh_script_progression --message="Adding a configuration file..." --weight=1
 
 domain_path=https://$domain$path
 
-ynh_add_config --template="../conf/config.php" --destination="$install_dir/config.php"
+ynh_add_config --template="config.php" --destination="$install_dir/config.php"
 
 chmod 400 "$install_dir/config.php"
 chown $app "$install_dir/config.php"
diff --git a/scripts/upgrade b/scripts/upgrade
index 9df6460..0797a0c 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -43,7 +43,6 @@ then
 
 	# Download, check integrity, uncompress and patch the source from app.src
 	ynh_setup_source --dest_dir="$install_dir"
-	#ynh_setup_source --dest_dir="$install_dir/plugins.local/data_migration" --source_id="data_migration"
 	echo "$(ynh_app_upstream_version)" > "$install_dir/version_static.txt"
 fi
 
@@ -77,7 +76,7 @@ then
 	ynh_script_progression --message="Updating a configuration file..." --weight=2
 
 	domain_path=https://$domain$path
-	ynh_add_config --template="../conf/config.php" --destination="$install_dir/config.php"
+	ynh_add_config --template="config.php" --destination="$install_dir/config.php"
 
 	ynh_script_progression --message="Upgrading the database..." --weight=2