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Philosopher - 11:13 pm on Jan 10, 2008 (gmt 0)
yes, it is used for virtually every piece of mail, but you will almost never see a person writing the +4 when addressing something. What the post office does with it once they receive it is another story all-together. [edited by: Philosopher at 11:14 pm (utc) on Jan. 10, 2008]
I guess I should have been a bit more precise. ;)