Thank you @dan.woda , it definitely could solve my problem, but also I would like to understand why this issue occurs
(Maybe another solution exists)
I found information about Auth0’s built-in email provider restrictions and the only one of them seems appropriate for such delays, it’s bounce rate limits.
But I use this auth0 account only for application in testing so I’m not sure that bounce rate could be enough height for reducing or blocking the ability to send emails.
Could these delays be caused by another restriction?