Irish posties are now so renowned for being able to deliver post regardless of the vagueness of the address, people are trying to test them.
David Curran runs a blog, Me Versus An Post, where he trys to see the lengths An Post will go to get a letter to its destination.
And his latest is pretty impressive.
David posted a letter with no address, just a map of where in Wexford he wanted it to go.
And did it work?
Of course it did! The letter showed up to the Hook Head lighthouse the next day,
We look forward to David's next try - we have a feeling the posties relish the challenge.