We recently discovered the inconsistent and high bounce rate numbers for the emails we sent out each month were likely due to not having DMARC. We've now added it within our domain, so companies like Google will more consistently receive our emails positively. But until recently, we had no idea Google & Microsoft changed their security demands in 2024/2025, it was just by chance an external person knew about the change and mentioned it.

Being a one-man band how do I keep onto of these things?