I'm guessing most of us understand that 99% "delivered" is just the starting and doesn't mean a lot. But here's the problem — "delivered" just means the receiving server accepted the message. It has no idea whether it went to inbox, spam, or quietly got buried. We've always known this, but we've kind of just... lived with it. That's about to change because of a new authentication protocol called DKIM2, and ESPs will implement it soon! Here's the part that matters for you: Right now, if Gmail accepts your email and then decides it's spam, it either dumps it in the spam folder or silently drops it. It can't bounce it back to you because email addresses get forged all the time — a delayed bounce could end up harassing a completely innocent third party. So providers just eat it. DKIM2 fixes the technical problem that caused this.…