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Address labels should contain the name of the designator (or of the department the package is destined to), name of the company, street, city area or district, city or town, the country and the afferent postal code. Any other type of additional information is written on the envelope or package.

Usually, any type of not filled address labels determine the post office to return the envelopes to the sender, so I hope you didn’t forget to fill your address in. You could go and ask the post office where you left the envelopes at what has happened to them if you don’t get a reply in a couple of days.

All you need is a word processing program and knowing how to use it a little. Taking into consideration you already know how address labels should look like, all you have to do is pick a suitable template and start designing on it using the drawing and writing tools offered by the program.