diff --git a/build/start-container.sh b/build/start-container.sh
index 81c6271..4b16d0f 100644
--- a/build/start-container.sh
+++ b/build/start-container.sh
@@ -12,4 +12,6 @@ from ${SMTP_FROM}
 user ${SMTP_USER}
 password ${SMTP_PASSWORD}" > ~/.msmtprc
 
+chmod 600 ~/.msmtprc
+
 echo -e "Subject: ${SUBJECT}\n\n${MESSAGE}" | msmtp ${TO_ADDRESS}
\ No newline at end of file