PC-SPEZIALIST
Enabling MTA-STS & TLS-RPT for digitalocean.com would be nice for enhancing the (mail) security a bit.
Here are the links for your e-mail system (Google Workspace) and e-mail compliance tool (dmarcian):
https://knowledge.workspace.google.com/admin/gmail/advanced/about-mta-sts-and-tls-reporting
https://dmarcian.com/mta-sts/