Check the input login email is found or not?

Hello,

I want to check the given email in the Login page is in the database or not, if the email does not found in the database, I have set an error message, which I want to show. Can anyone suggest me the correct condition to do so?

Assuming your valid emails are on a table (here they are on CustomerEmails).

Screenshot

This is my Group Login, of Sign up / Login popup. Here I’m trying to show the given email validation text, only when a user’s given email does not found while logging in. So for that, I am trying to put your thoughts. But not able to make the changes. Can you please elaborate on the easy words?

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