Currently DMARC is the most modern way to improve the deliverability of your emails. This tool is a pretty solid deal to improve your deliverability of emails, using a very friendly user UI/UX.
If you ever wanted to control who is sending phishing email purporting to be from your domain and see in one dashboard all email forensics then this tool is for you. Check your DMARC compliance and configure accordingly the DMARC policy you deploy. Nice articles and videos to help you get started if you are not familiar with DMARC yet.