Auth0 Support Center - Email and OTP Slow Delivery

Email and OTP Slow Delivery

Sep 10, 2025

Overview

We are seeing some inconsistencies using the OTP based login flow. Sometimes in takes 2-3 mins to get the OTP. Sometimes it send otp after clicking on resend a couple of times, and even in that it sends the otp is of the earlier attempt and thus user sees otp not right message.

Solution

After confirming the delivery from Auth0 was successful suggest the customer check the logs on the email provider end around the timestamp and check whether any issues appear on the email provider end.

Please check the following items in the Email Provider setting/configuration:
- the sender email in the Email Provider
- the logs in Email Provider for messages related to the successful logs from Auth0
- consult Email Provider documentation on errors that might arise in their logs
- contact Email Provider support if none of the others thrives results

Here is a community topic on the same issue: https://community.auth0.com/t/verification-emails-sent-as-it-looks-in-the-logs-but-not-received-by-users/90780