diff --git a/public/ispmail.sh b/public/ispmail.sh
index 6cf5eef..a08d06c 100755
--- a/public/ispmail.sh
+++ b/public/ispmail.sh
@@ -392,7 +392,7 @@ EOF
   if [[ -d /var/vmail/example.org/john/Maildir/new/ ]]; then
     rm -f /var/vmail/example.org/john/Maildir/new/*
   fi
-  swaks --server localhost --to john@example.org --tls --silent
+  swaks --server localhost --to john@example.org --tlso --silent
 
   DELIVERY=0
   for i in $(seq 1 50); do