Reply sentiment labels
When a prospect replies to an email you tracked, Outsolvi puts a label on it: Positive, Negative, Neutral or Out of office. The point is triage. The reply that asks for a call shouldn't wait behind the one that says the person is on holiday.
The labels come from keyword rules, not an AI model, and we'd rather say so. Rules are predictable: the same words always get the same label, and you can see why. They also miss things a person wouldn't, like sarcasm or a reply that says two things at once, so read the replies that matter yourself.
Who this is for
A rep wants replies sorted so the interested ones get answered first, and wants to know exactly how the sorting works before trusting it.
Labels, not a score
Every detected reply gets a label
Positive, neutral, negative, or out of office for auto-replies, set by keyword rules rather than AI. The label shows on the tracked email's page and in the follow-up queue, so you can sort a morning of replies without opening each one.
"This looks useful, can you send times for Thursday?"
"Thanks, I will take a look and come back to you."
"Unfortunately we have just signed with someone else."
Outsolvi matches keywords in the reply to label it. It does not write the answer for you, and there is no auto-pilot that replies on your behalf.
What it does
Reads the start of each reply to a tracked email, matches it against keyword rules and shows a label on the email's page in Outsolvi and in the follow-up queue. A reply asking to be removed also stops Outsolvi sending to that address in every sequence.
Why it matters in 2026
The replies that ask for a meeting are the ones worth answering first, and a label makes them easy to spot
Keyword rules are predictable: the same words always get the same label
An out-of-office reply gets its own label, so it doesn't look like interest
Knowing how the label is made tells you when to trust it and when to read the reply
It all works from your very first send.
Install on Outlook or Gmail and start the 14-day free trial. Opens are graded and hot leads flagged from the first tracked email, replies get labeled as they're detected, and Write with AI drafts your follow-ups. No card.
How it works
Outsolvi reads the first 200 characters of the reply and its subject line, and checks them against keyword rules in a fixed order. Words about booking time, such as a demo, a call or a calendar, a question about pricing or a proposal, or a pointer to someone else to talk to, make a reply Positive. "Not interested", "no thanks", a request to unsubscribe, and hedges such as "maybe" or "need to think" make it Negative. Out-of-office phrases get their own label. Automatic replies, forwards, bounces, wrong-person replies and anything the rules don't recognize are Neutral. The rules are in English. To label a reply, Outsolvi has to see it: through a mailbox connected with read access or over IMAP, through the Gmail extension when you open the thread, or through the desktop Outlook add-in while Outlook is running. The Outlook web add-in doesn't report replies.
Some tools sort replies with an AI model, which can catch nuance and can also be confidently wrong. Outsolvi's labels are rules you can predict. Either way, they're a triage aid, not a substitute for reading the reply.
Use cases for Reply Labels
Frequently asked questions
Is this AI?+
No. The labels come from keyword rules. We'd rather tell you that than dress rules up as a model.
How accurate is it?+
We don't publish an accuracy figure. Rules are predictable, but they miss sarcasm, mixed messages and replies in other languages. A hedge like "maybe next quarter" is labelled Negative, which is cautious on purpose. Read the replies that matter yourself.
Does it work on non-English replies?+
Not well. The rules are in English, so a reply in another language usually ends up Neutral.
Can I change a label?+
No. The label is set by the rules when the reply arrives.
What does Outsolvi keep from a reply?+
About 200 characters of the latest reply, shown next to its label. If you connect your mailbox, its synced mail, sent mail included, is stored too, encrypted.
Where do I see the labels?+
On the tracked email's page in Outsolvi's web app and in the follow-up queue. The Outlook add-ins and the Gmail extension don't show them.
Free tools, articles, and glossary entries that share a topic with this feature.
Try Reply Labels for free
14-day free trial, no credit card, up to 250 tracked emails. Reply Labels 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 Reply Labels.
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.