If you use Google Domains, login to your account at https://domains.google.com, choose your domain, then select the edit DNS record option. ... How to set up Google Apps in 5 simple steps ...

Google Domains also offers free email forwarding for up to 100 email aliases. However, if you are going to host your email, you’ll need to setup the email DNS records for your email provider.

When sending an email, you can write anything you want in the 'From' field, so it's easy to spoof someone else. When someone sends an email spoofing a domain you own, engineer Vivek Gait ...