okay so i kinda wanna know how to make a hopper mail box system but im not sure how to make the command? so like what i want to do is when someone throws something into the hopper i want it to notify me that there is mail in my mail box because i think it would be very cool tbh and im realy new to command blocks and redstone and stuff sooo yee xD

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2 Answers

You can do this without command blocks, just put a chest under the hopper and run a comparator from the hopper to whatever you want to notify you, like a note block or redstone lamp.

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Here is a very basic circuit to notify the presence of an item. I used a chest but you can use a hopper if you like.

Comparator directly out of a chest. Place one item in the chest and comparator outputs a signal of one:

Here is the same circuit but it shows that a comparator can be used through a block. This could be used to have a mailbox outside the house and the indicator on the inside of the house.

This is the same circuit as above but there is an item in the chest and a redstone lamp: