Do following. The screenshots are from Excel 2013 and should be applicable to Excel 2016 as well.
- File > Options > Quick Access Toolbar > Choose "All Commands" in Choose Commands From: box > Select "Send to Mail Recipient" and Add to right side. Now, this icon will be added to QAT.
- Now, press this icon in QAT and you will get the option to send either Worksheet or Workbook to mail.