Email and OTP Slow Delivery

Problem statement

We are seeing some inconsistencies using the OTP-based login flow. Sometimes it takes 2-3 mins to get the OTP. Sometimes it sends an OTP after clicking on resend a couple of times, and even in that it, the OTP it sends is of the earlier attempt, and thus user sees an error about having the wrong OTP.


Once you have confirmed the delivery from Auth0 was successful, we recommend that you check the logs from your Email Provider around the timestamp of when these events occurred to see whether any issues appear on the Email Provider’s side.

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 your logs
  • contact Email Provider support if none of the other steps yield results

Here is a related community topic on the same issue: Verification emails sent as it looks in the logs, but not received by users