Is “Sender Score” still relevant?

You've been watching your Sender Score tick up and down, wondering if it actually moves the needle. The short answer is: it's still worth checking, but it's no longer the number you build your whole strategy around.

Validity's Sender Score gives you an IP reputation score based on their data network. It can flag issues early, and some smaller mailbox providers do still reference it. But the big inboxes have largely moved on to their own systems, and those are the ones that actually decide where your mail lands.

Gmail Postmaster Tools gives you Gmail-specific domain and IP reputation, spam rate, and delivery error data straight from Google. If Gmail is a significant chunk of your list (and for most senders it is), this is the dashboard you want open every week. It tells you what Google actually thinks of your sending, not what a third-party score estimates.

Outlook's Smart Network Data Services (SNDS) does the same thing for Microsoft's ecosystem. You can see complaint rates, spam trap hits, and IP status across Hotmail, Outlook, and Live addresses. Free to access, and surprisingly useful if you've got any legacy B2C contacts.

So where does Sender Score fit? Think of it as a general health check, not a diagnosis. A low score is worth investigating. A high score doesn't mean Gmail is happy with you. The metrics that actually count are the ones coming from the mailbox providers themselves, and both Gmail and Outlook give you free access to exactly that data.

If your Sender Score just dropped or your Gmail reputation is showing red, that's when you want to dig deeper. You can check your domain's authentication setup with our free Email Header Analyzer, or if something looks broken and urgent, the SOS hotline is free (no pitch, just help).