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on 12/8/15I would read the guidelines Nextdoor has posted for members. I pretty much details the capability of this website. However, They do not have this capability or it would be built into the message so that you select notification of a response.
If they respond back
No, NextDoor does not have this capability (yet).
Send a request to the recipient asking if they had an opportunity to read your message and that a yes or no response is adequate.
I doubt NEXTDOOR will send you a delivery or "opened" confirmation as this is typically done by email apps, not Website postings.
I have no clue...