"Read receipt" on conversations?

[TomCann]

One of my members organizes complicated social events for members. Often he has to make sure others have seen an important bit of information from him. He does this with conversations, but is frustrated that he cannot tell if someone has opened his message. He has asked if a conversation could have a flag against it to show him who has opened his message - a bit like a 'read receipt' on email.

Does anyone know if this can be achieved?

An other step would be that sometimes he starts a...

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"Read receipt" on conversations?

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