Diagnose: see why every open counted
Every email tracker shows you a number. Almost none of them can show you where the number came from. When your tracker says a proposal was opened 47 times, you have two options: trust it, or ignore it. Neither is great when a real deal is on the line.
Diagnose is Outsolvi's answer. Choose Diagnose on any open and you get the evidence behind the decision, in plain words: which rule fired, when the open arrived relative to your send, what network and software it came from, and why Outsolvi concluded it was a person reading your email or a machine peeking at it. If we filtered an open out, you can see that too, along with the reason.
Who this is for
If an email tracker has burned you before, this is for you. You saw an open, called the prospect, and they had never seen the email. You want a tracker whose numbers you can actually verify instead of taking on faith.
Available on every event
Ask any event why it was graded that way
Diagnose opens on filtered events too, not only counted ones, so a false positive is as checkable as a real read.
- Event
- Open, Mon 9:14:02 AM
- Source IP
- 203.0.113.9
- Location
- Dublin, IE
- Client
- Defender for Office 365
- Rule that fired
- Microsoft Defender detonated the message to scan it
- Verdict
- An automated system opened it, not a person
What it does
Diagnose turns every open event into an explanation. Instead of a bare timestamp, each open carries its grade, a plain-words reason and a Diagnose view of the signals behind it. It works for counted opens and filtered opens alike, so you can audit both what we told you and what we chose not to tell you.
Why it matters in 2026
Trust in tracking numbers is broken. Apple Mail Privacy Protection and corporate security scanners generate machine opens on a lot of B2B email, and a tracker that counts them all is quietly misleading you.
Gmail is different. When Gmail fetches the tracking image through its proxy, a person opened the email, so Outsolvi counts it as "opened in Gmail", once, even if one read causes several fetches. When Gmail preloads images as an email arrives, before anyone opens it, that is labelled "Gmail preloaded this" and not counted. If you send from Gmail, your own look at your Sent folder is shown but not counted.
A superlative like 'most accurate' is just marketing. An open you can click and audit yourself is proof. Diagnose exists so you never have to take our count on faith.
When a rep sees why an open counted, they act on it with conviction. A most-likely human open from a normal browser at 9:14am is worth a call. Knowing that difference is the whole point of tracking.
Filtered opens matter too. If a prospect's company scanner pre-fetches every email, Diagnose shows you that pattern, which tells you their raw open data was never going to be usable and reply signals should drive your follow-up instead.
Open grading is not a setting you configure.
Install on Outlook or Gmail and every open on the next email you send is graded. 14 days free, no card.
How it works
Each open is graded by the same rules described on the confidence-scoring page: timing relative to send, network origin and client signature. Diagnose exposes that grading one event at a time. On a tracked email's page in Outsolvi, choose Diagnose on any open or click and a panel explains why it was classified that way: the rule that fired, what Outsolvi saw (time after send, network, browser signature, earlier activity) and how often that rule has been right over the last 30 days, or "Not enough feedback yet". Nothing to configure and nothing to turn on.
Some trackers filter machine opens behind the scenes: Yesware says it filters proxy and security-scanner opens, and HubSpot says it excludes bot activity. What you see is the result. Every vendor makes judgment calls about what counts as an open, and Diagnose lets you check Outsolvi's, one open at a time.
Use cases for Diagnose
Frequently asked questions
Do I need a special plan to use Diagnose?+
No. The per-open evidence view ships with every plan, including the 14-day free trial. It is core to how Outsolvi works, not an upsell.
Can Diagnose be wrong?+
Yes. The rules are checked every week against replies, clicks and user corrections, and edge cases still exist. That is exactly why the evidence view exists: when a grade looks off to you, you can see the reasoning and judge for yourself instead of arguing with a black box.
Does it show filtered opens too?+
Yes. Opens that fell below the confidence floor are visible with their reason for exclusion. You always get the full picture: what we counted, what we filtered, and why.
Does Diagnose work in both Outlook and Gmail?+
Yes. The evidence view lives in the Outsolvi dashboard and covers every tracked send regardless of whether it went out through the Outlook add-in, the Gmail extension, or the web app.
Free tools, articles, and glossary entries that share a topic with this feature.
Try Diagnose for free
14-day free trial, no credit card, up to 250 tracked emails. Diagnose is included, so you can test it on your own email before you pay anything.
Start 14-Day Free TrialWhere this feature is used
Use cases, workflow patterns, and personas that depend on Diagnose.
Other Outsolvi features
Nate built Outsolvi after watching every email-tracking tool he had ever used lie to him about opens. Outsolvi grades every open as a person or a machine, in Outlook and Gmail, so the number on the dashboard is one a rep can actually act on.
We update these pages when the underlying mechanics change. new mailbox-provider rules, new tracker behavior, new measurement gaps. The dates above are real revisions, not auto-touches.