Hi there Synergyse! It can. Unfortunately, it doesn't look like Google lets users set up DMARC for regular Gmail accounts. But, you can set up DMARC for Google Apps emails. First you need to set up DKIM and SPF for your Google Apps domain. Once DKIM and SPF are set up, you should start to implement DMARC slowly. Here's a good resource that will help you implement it: https://support.google.com/a/answer/2466563?hl=en. Thanks and let me know if you have any other questions!