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由于具有维持为公众传递讯息的重要功能，通常被视为公用事业的一环，也因此世界各地的邮政系统大多为专营或强迫性垄断性质的公营事业。各邮政系统基本上均有快递业务，而快递与物流的性质类似，部分较具规模的邮政机构甚至会跨足经营物流事业。
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