By default estimate goes through Intuit email id, customer saved that email now customer saved that email id and send me mails on it. Howcan we get notice and check mails

Hi @adeshengineering. 

Welcome to the Community!

I'm here to help you with your estimate concern.
 

You can download your estimate and manually send it to your customer using your personal email. In that way, both of you will get notified.

You might find the pointers below interesting. This will provide you steps on how to email other sales forms and ways to customize them in QuickBooks Online as well as turning an estimate into an invoice:

• Email and customise sales form.
•  Convert Estimate to Invoice.

I'm always here to help if you have any other estimate concerns. Just tag my name in the comment section and I'll get back to you as soon as I can. Stay safe.