Deleting Messages in Telegram
I've read Telegram secret chats when you delete messages the client the message is deleted for the receiver of the message. However in regular Telegram chats when you delete a message, the message is not deleted on the receivers end, it is only deleted on your local client.
Allow messages that have been sent, but not read by the receiver to be deleted on both the originator's chat and the receivers chat.
Here's a common valid use case. You are chatting with several people, and accidentally send a message intended to be sent to another person (we've all done it), realizing the mistake you wish to delete the message before it is read by the unintended recipient.