diff --git a/src/mailer.js b/src/mailer.js
index 622013cfe..3b1b62436 100644
--- a/src/mailer.js
+++ b/src/mailer.js
@@ -76,7 +76,8 @@ function sendMail(mailOptions, callback) {
             auth: {
                 user: mailOptions.authUser || `no-reply@${settings.adminDomain()}`,
                 pass: data.relayToken
-            }
+            },
+            tls: { rejectUnauthorized: false }
         }));
 
         transport.sendMail(mailOptions, function (error) {