For example, whereas the old postcode 1003 covered Epsom, Mount Eden, and Mount Albert, these suburbs now have separate postcodes from one another.
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Under the old system, Auckland, Wellington and Christchurch were divided into postal zones, which were incorporated into the post code system for use in bulk mailings.
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Under the new system, some suburbs in Auckland, Wellington and Christchurch now either have their own postcode, or share one with fewer suburbs.
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