How to validate email address that actually exists using Rails

Hi,
I know how to validate form using rails but I’m curious to know, How to validate an email address That actually exists Using Ruby on rails.
For example, “wdshuvo@gmail.com” it’s my email. So I’d like to check if it really exists or not.

I really need it. I hope you will help me.

Thank you very much

I feel your pain.
Some user just stubbornly don't accept that they got the wrong email address.

For such normal use case, I use Amazon SES as my transactional email sender.
They deliver bounce reports in various channel (including HTTP) via their SNS service.

See more info about it here:
https://aws.amazon.com/blogs/messaging-and-targeting/handling-bounces-and-complaints/

Once you got the bounce report, which contains the email address, you'll know that the email does not exist.

This works great in every project I encountered so far. It has a little acceptable limitation though, you can't tell unless you try sending an email.

If you design your application in a way that users can resend confirmation emails. You'll able to provide a nice and friendly notice there.