Read Receipts: Implement a visual indication for messages if and when they have been read by other users of the channel
Sometimes one's wondering if a post has already been read by other users. I could image that a member list of the channel pops up when one is selecting the read status from the particular post menu ("[..]").
In private chats, a sinple check sign (similar to whatsapp) could signalize if a message had beend read by your counterpart.

We’ve opened a design ticket to start exploring this feature: https://mattermost.atlassian.net/browse/MM-36529
This will need feasibility explorations given performance concerns on the server-side. As a result, we may start by only offering read receipts in Direct Messages and Group Messages that have a maximum of 8 users.
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Florian commented
A plug-in that show you: read or not read of a message (like WhatsApp / WhatsApp-Web)
read confirmation: Chat is open and the application is in the foreground -
Ronny Hanssen commented
For enterprise use this is **really** helpful. I know there are no algorithm that can really guarantee that a message has really been read, unless the user explicitly clicks on i.e. a checkbox, which could basically then just be a reaction icon. But, there should be an algorithm that is able to find out if the message has "most likely" been read or not. We were used to Flowdock, which seemed to do a pretty good job in this respect. We used this feature all the time back then, and it is sorely missed in Slack.
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Anonymous commented
I want to see if the opponent reads the message what i sent in DirectMessage.
If opponent read the direct message what i sent, the read sign is shown to me.
If opponent reads the message what i sent, then i want to see read mark on DirectMessage. -
Kevin L. commented
Our customers on Enterprise deployments are requesting this feature as well. Would really help with managers being able to see if subordinates got their message, etc.
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Warren Postma commented
Slack tells me when users are offline and not receiving their notifications (presumably notifications queued until beginning of business/work hours the next day), and allow me to break through if I want. Not sure I like the ability to hound people at all hours, but I would LIKE to know whether the user is PRESENT (say, has a web or desktop client window open).
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Kathrin Leuckel commented
It would be very useful to see if the recipient as already seen a message.
Especially if it's a personal message. And also for messages with a notification like @channel oder @somebody.Maybe with an eye-symbol. Mouse-over on that symbol could show whom has seen the message.
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fjarlq commented
This feature would raise privacy issues. Sometimes, users prefer to lurk and not reveal their presence or activity.
For example, in iOS the Messages > Send Read Receipts option is off by default.
Therefore, if this feature is implemented, I think it should come with privacy controls and reasonable defaults.
That said, I would not object to this feature being used by willing participants, of course!
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User404 commented
Highlight messages as uread if user haven't read them yet.
Should look like message highlight (grey?) type.