Mail will not arrive there as mail will be stopped in post-office
because of incorrect (not existing) address.
Nope - Try it yourself. If you live in Examplestreet 10 and you start
sending yourself postcards with Examplestreet 10a they'll reach you.
Post offices often have a good time trying to decipher incorrect
addresses. Sometimes they even decipher a map [1] - other times they get
a name, town and country and go from there - playing detective can be
fun.
[1]
http://skessuhorn.is/2016/05/20/frumleg-aritun-sendibrefs-en-dugdi-tho/
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