When viewing your saved Quote details, at the bottom of the Quote select the View PDF button. 

Once you have opened the PDF, then the option to Email the Quote will appear at the bottom of the page. 

When the option to Email the PDF is selected, then a new window will open with the Client's email address pre-populated, along with the standard email content. You can modify the Quote email by going to the Settings Cog > Accounts > Quotes.

From this window, you can add a recipient, add any attachments such as a brochure or detailed terms and conditions, modify the email content and copy in your company email to receive a copy of the notification for reference.