hey can I disable original implementation function for sendEmail , and always makes it mandatory to provide the configuration?

Hey @paras could you elaborate? The question isn’t clear.

I was finding a way where a user should always provide config for sending email, rather than using the default implementation when no config is provided https://supertokens.com/docs/emailpassword/email-delivery/custom-method

who is the "user" here? Your customer? I still don't understand the context

yeah the one using my website, the customer

so your customer will be able to change the code on your backend? Im still confused..