Hi Team, It is possible that we can send an email thru chat bot or the chatbot automatically send an email ?

It's not possible within Botpress, but you can do an integration with other platforms (Zapier is very popular, i also heard about make.com)

Gmail integration?

Yes

I havent used it my self but i would try the Gmail integration on botpress before Zapier: https://app.botpress.cloud/hub/integrations/9aa9eef8-edc4-4340-8567-4fcbfa3e264d