How to send email to contact directly from the ZOHO CRM

How to send email to contact directly from the ZOHO CRM

Hello, we have used the ZOHO CRM standard edition for our website www.ijdmtoy.com for RMA process purpose.

In this use, we need to send customer RMA#.

There is a field called customer email, and we want to know whether we can use the ZOHO to directly send reply to this email.

I know whether I can send email back to myself, but how about for a customer's email?