This question is intended for the audience whose smtp authentication is working & the server is able to authenticate when the session starts from EHLO.
I want to ask, what is the behavior when the user just connects from a HELO session?
In my case, from a HELO session, it doesn't ask for authentication & the user is able to send the mail?
Should there be a way to disable HELO & only allow EHLO ?
Can you please tell me the exact expected behavior ? & the solution to resolve this ?