Read Receipts in Slack and Teams: Who Can See You've Read a Message
You sent the message three hours ago and heard nothing back. Did they even see it? Microsoft Teams will sometimes answer that question for you. Slack does not provide a per-person read receipt. This guide covers what each app shows, what it never shows, and the reliable ways to get an acknowledgment, according to their own help pages.
Miles Crawford
The short answer
Microsoft Teams has read receipts: when someone reads your chat message, a Seen confirmation appears next to it. They only work in one-on-one and group chats of 20 people or fewer, and depend on receipt settings and activity in the chat window.
Slack does not provide a per-person Seen receipt for messages. The closest feature is message activity, an aggregate count of how many members viewed a message, and only on certain plans.
Teams: what Seen actually means
When a recipient reads your message while active in the chat window, Teams shows a Seen confirmation (an eye icon) next to that message. Until then you only see the confirmation that the message was sent.
Seen is narrower than it sounds. Microsoft's help page is explicit about what does not trigger it: reading the message in a notification, in a banner pop-up, in the Activity feed, or from a quick entry point like someone's profile. Only being active in the chat window itself marks the message as seen. And everyone in the chat must have read receipts turned on: you get no receipt from anyone who turned them off, or from anyone outside your organization.
Teams: where receipts work and who controls them
Per Microsoft's messaging policy documentation, read receipts apply to one-on-one and group chats of 20 people or fewer. Channel conversations do not have per-person read receipts, no matter how small the channel.
Read receipts are on by default for everyone, but your admin decides whether your organization has the feature at all and whether you can switch it off. Admins can set receipts to user controlled (on by default, users may turn them off), on for everyone, or off for everyone. To check your own setting, select Settings and more next to your profile picture, then Settings, then Chats and channels, and look for Read receipts.
Slack: no read receipts, but aggregate counts
Slack does not show senders who has read their message. What Slack offers instead is message activity: hover over a message, click the three dots icon and select View message activity to see how many members have viewed, reacted to or clicked it, a graph of views over time, and a breakdown of which devices people first saw it on.
Slack's own help describes this as how many people interacted with a message, not who. It is deliberately aggregate: counts, percentages and reply previews, not a per-person Seen list. And it comes with gates. Message activity covers messages sent in the last 12 months in channels with at least 50 members, requires a Business+ or Enterprise plan, and is limited to owners, admins and anyone given the Message Activity Manager role. On Business+, it is not available in private or Slack Connect channels; Enterprise organization owners and admins can enable it in Slack Connect channels.
Your own read state in Slack is private
Slack tracks your unread messages for you alone. The Unreads view on desktop and Catch up on mobile are personal catch-up tools: you can scan what is new, mark messages as read, react or reply, and jump into the conversation. Sorting and filtering options for unreads are desktop only, and filtering by custom sidebar sections needs a paid plan.
Your Unreads or Catch up view is a personal catch-up tool, not a sender-facing receipt list. Marking a message unread does not ask its sender to follow up. Keep this separate from visible actions such as replies and reactions, and from eligible channel message-activity counts.
When you really need to know
When the work depends on an answer, ask for the specific response you need. An acknowledgment, acceptance and completed task are different states. Our suggestions:
- Ask for a reaction. Agree on what a reaction means before relying on it. A thumbs up might mean receipt, agreement or thanks; a check mark might mean completion. Neither symbol has one universal workplace meaning. If an approval, owner or deadline matters, ask for it in words. Our reactions follow-up guide shows how to keep that norm from losing track of things.
- Ask for a one-word reply in the thread. A quick "got it" keeps the acknowledgment attached to the original message instead of starting a new one.
- For big announcements in Slack, use message activity. If your plan and channel size qualify, use aggregate views as one measure of reach. They do not establish that a particular person understood, accepted or completed an action.
Choose the confirmation the work needs
This decision aid is our suggested wording, not a platform guarantee or workplace policy.
| You need to know | Ask for |
|---|---|
| The person received the information | A brief acknowledgment with an agreed meaning |
| Someone owns the next action | An explicit owner and realistic reply or finish time |
| The work is approved or complete | The actual decision or result, not a read marker |
Fictional example: Please confirm that you can own the supplier check and when you expect to finish. A receipt is useful, but I cannot mark the review complete until the check is done.
If the request remains unanswered, our work-message follow-up guide covers response windows and appropriate escalation. Silence is not approval.
What to be careful about
- Seen means the window was active, not that they read carefully. Teams only counts activity inside the chat window, so treat Seen as "the chat was open," not "they understood."
- No Seen does not mean unseen. A message read entirely in a notification or banner never gets a receipt in Teams, so silence tells you nothing either way.
- Big group chats lose receipts. Past 20 people in a Teams group chat, read receipts stop applying.
- Check receipt settings. Microsoft says you will not see receipts from someone who has them off or is outside your organization. In a group, distinguish an individual receipt from the Seen confirmation shown when everyone has read the message.
- Slack's message activity is numbers, not names. It can confirm reach on an announcement, never that a specific person saw it.
Sources
Checked October 29, 2026. The steps and limits follow each product's own help articles. The acknowledgment suggestions are ours.