diff --git a/DOC/schleuder3/install_schleuder3_debian_package.txt b/DOC/schleuder3/install_schleuder3_debian_package.txt
index 11f4952..e980ada 100644
--- a/DOC/schleuder3/install_schleuder3_debian_package.txt
+++ b/DOC/schleuder3/install_schleuder3_debian_package.txt
@@ -166,7 +166,7 @@ fi
 cat << EOF > $virtual_schleuder_domains_file
 dbpath = /var/lib/schleuder/db.sqlite
 query = select distinct substr(email, instr(email, '@') + 1) from lists
-        where email like '%%%s'
+        where email like '%%@%s'
 EOF
 
 # - Add 'sqlite:$virtual_schleuder_domains_file' to virtual_mailbox_domains