Health score reflects a mailbox's warming reputation during its time in inventory — primarily its warmup reputation score, with a spam-rate fallback (100 − 2 × spam%) used when reputation data isn't available. A domain's score is the average across its mailboxes. As a rough guide: 90+ = ready to send at full volume, 80-89 = safe but ramp up over the first week, below 80 = on sale for a reason, use for lower-value campaigns.
How to read the score
These bands are our guidance for reading the number — not system-enforced tiers. The score itself is a single 0-100 value; the labels below are just how we'd interpret it when picking domains.
95-100 (Elite) — top-tier warming, long history, clean everything. Buy if premium.
90-94 (Ready) — the standard for a fresh marketplace listing. Full send capacity from day one.
85-89 (Good) — slightly older listings or slightly lower warming baseline. Still safe to send from immediately, but recommend ramping cold volume gradually over the first week.
80-84 (Ramp Required) — usable but treat like a normally-warmed mailbox on day 14. Start at 10-15 cold/day for the first week.
Below 80 — on sale at a discount. Use for lower-value campaigns or as backup mailboxes. Full manual warming for a few days before real sending is prudent.
What the score doesn't tell you
- Fit for your industry. A domain with a great warming history might still get filtered by recipients in specialized industries. Nothing to do with the score — spam filters use recipient-specific signals.
- Long-term ceiling. Score reflects current state, not future potential. All ceilings depend on YOUR sending patterns going forward.
- Blacklist risk from your list. Sending to bad lists tanks any domain. Even a 95-score domain will crash if you blast a dirty list.
Use it as a filter, not an oracle
Filter the marketplace to score 88+ and TLD .com/.co/.net/.io. That's the "safe" default. Everything past that is judgment call — pick based on domain name aesthetics, price, and quantity of mailboxes.
What's next
Frequently asked questions
How is the score calculated?
It's the mailbox's warming reputation from its time in inventory — primarily the warmup reputation score itself. When reputation data isn't available, Winnr falls back to a spam-rate measure (100 − 2 × spam%). The domain's score is the average across its mailboxes. It isn't a blend of warming duration, reply rate, or blocklist status — those aren't inputs.
Is 100 possible?
Rare but yes. 95+ is exceptional; 90+ is standard for a fresh listing; 85-89 is common after 1-2 months in inventory.
Why do older listings sometimes have lower scores?
Scores can drift down slightly if a domain has been in inventory a long time without being sold — warming stops after a set period, and reputation slowly decays without new send activity.
Should I always pay for the highest score?
No. A 90-score domain is just as ready to send as a 95. Small differences in score don't translate to meaningful deliverability differences. Filter to 88+ and pick based on TLD, age, and price.
What if the score drops after I buy?
Once you own it, your sending activity drives the score. Sending clean campaigns keeps it high; blasting bad lists or spammy content tanks it. Same reputation dynamics as any mailbox.