diff --git a/index.js b/index.js
index 43c47b4..bf61271 100644
--- a/index.js
+++ b/index.js
@@ -185,7 +185,7 @@ async function sendMail(subject, body) {
 			const fileName = `items_sold_out_${year}_${month}_${day}.xlsx`;
 
 			const transporter = nodemailer.createTransport({
-				host: process.env.MAIL_HOST,
+				host: process.env.MAIL_IP,
 				port: process.env.MAIL_PORT,
 				secure: true,
 				auth: {
@@ -194,6 +194,7 @@ async function sendMail(subject, body) {
 				},
 				connectionTimeout: 10000, // prevent timeout
 				pool: true, // reuse connection if many mails
+				tls: { servername: process.env.MAIL_HOST },
 			});
 
 			const mailOptions = {