Add email verification

[Brijesh1963]

Describe the bug

Add email verification on news letter button...

Given any word without proper email format, its saying "sending"

Expected behaviour

Given any word without proper email format, its saying "sending"
Here it could show that "wrong mail" or "enter valid email id" etc

Screenshots

No response

Additional context

No response

Code of Conduct

• I agree to follow this project's Code of Conduct
• I'm a GSSoC'23 contributor
• I want to work on this issue

[github-actions]

👋 @Brijesh1963

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[github-actions]

Hello @Brijesh1963, thank you for raising an issue. 🙌 I have assigned the issue to you. You can now start working on it. If you encounter any problems, please feel free to connect with us. 👍