diff --git a/.deploy/Dockerfile b/.deploy/Dockerfile
index 480b295..e4fe91a 100755
--- a/.deploy/Dockerfile
+++ b/.deploy/Dockerfile
@@ -79,7 +79,6 @@ ARG MAIL_USERNAME=${MAIL_USERNAME}
 ARG MAIL_PASSWORD=${MAIL_PASSWORD}
 ARG MAIL_ENCRYPTION=${MAIL_ENCRYPTION}
 ARG MAIL_FROM_ADDRESS=${MAIL_FROM_ADDRESS}
-ARG MAIL_ENCRYPTION=${MAIL_ENCRYPTION}
 ARG MAIL_FROM_NAME=${APP_NAME}
 
 ARG PUSHER_APP_ID=${PUSHER_APP_ID}