A health score can hide where the solo ad landed
Answer A pretty deliverability score is not the folder your solo ad landed in. Unspam's statistics, updated September 15, 2026, put their health score at 88 out of 100 and still found only 63 percent of tested mail in the inbox. Another 33 percent went to spam. Your seller's green bar is a third number, and it is not your click link.
The note that started this: Email Deliverability Statistics (2026): What Our Data Actually Shows, Andrian Valeanu, Unspam, updated September 15, 2026.
People buy the grade because the grade is easy to paste into a quote. Eighty-eight sounds like a clean bill of health. Sixty-three sounds like a coin flip you would not take with rent money. Both figures are in the same write-up, about the same body of tests. If you only repeat the flattering one, you are editing the source until it agrees with the purchase you already wanted to make.
Andrian Valeanu's piece at Unspam is the note that started this. He is explicit that the figures use the fixed window of Unspam's 2026 benchmark, January through September 2026, set against the full 2025 year. This is their test data, not a census of every newsletter on earth, and not a measurement of the list you are about to rent. Inside that window he reports a health score of 88 out of 100, up from 83 in 2025, an inbox rate of 63 percent, spam at 33 percent, about 3 percent sorted into tabs, and 1 percent missing or blocked. Read the pair. The score improved. A third of the tested mail still did not reach the inbox.
What inbox rate did Unspam report for 2026?
In the statistics piece updated September 15, 2026, Unspam said 63 percent of tested emails reached the inbox, 33 percent landed in spam, about 3 percent were sorted into tabs, and 1 percent were missing or blocked.
Those four shares are Unspam's, from the tests they describe. Do not add them to a different company's study and call the sum a law. Do not subtract your seller's open rate from 63 and call the difference a fraud score. The open rate is a different instrument, and on many mailboxes it is a robot. The only number in the quote that you can reconcile tonight is the click count on a link you issued.
When you buy solo ads, a seller who quotes "63 percent inbox" without saying whose test it was is borrowing a benchmark to decorate a file they have not measured. Ask them what they measured on their own domain, with their own recent mail, to the providers your offer actually needs. If they cannot say, the borrowed 63 is not evidence. It is a brochure.
Why can a deliverability score look better than placement?
Unspam put the health score at 88 out of 100, up from 83 in 2025, and still reported that only 63 percent reached the inbox. The score and the folder are different numbers.
A score can reward authentication, list hygiene, and the absence of a blacklist hit, and still watch a large share of messages file into spam because of the provider, the complaint habit, or the content. The folder is where the person lives. The score is a summary a vendor can put on a slide. Both can be honest. Only one of them tells you whether the solo ad had a chance to be seen.
Your seller's "delivered 99 percent" is usually a third thing again: a machine accepted the handoff. Yesterday's note on delivery receipts is the longer version. Today the point is narrower. Do not let a health score, a delivered bar, and an inbox study collapse into one adjective like "clean." Ask which of the three documents they are holding.
How should a solo ad buyer use someone else's benchmark?
Use it as a scale for the market they tested, not as a census of your seller's file. Your proof is still the link you control.
The scale is useful because it kills the fantasy that competent mail all lands in the primary tab. Even in a dataset whose authors rate the year as healthy, spam is a normal outcome for a large minority of tests. A solo ad is a guest email on top of that. It does not get a bonus for being paid.
Price the risk in the quote, not in a vibe. Solo ad pricing should name the day, the from-name, the link you control, and the refund if the mail does not go. Let Unspam's pair of numbers remind you that a high score and a missed inbox can sit on the same page. Then judge the seller by their page, not by someone else's.