| An international mail processing centre, or IMPC, is an office of exchange, which creates or receives dispatches, or a mail unit, which creates or receives consignments. |
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| The majority of IMPCs are both offices of exchange and mail units and are established and operated by a designated operator on the territory of the member country that has designated it to fulfill the UPU Acts. |
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| ETOEs are also registered as IMPCs but are operated by or in connection with a designated operator outside its national territory for commercial reasons. |
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| A small number of IMPCs have also been registered for military mail. The designated operator of a UPU member country may establish an IMPC where that country has a military presence over a period of time. |
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| Between 2000 and 2006, a small number of IMPCs were registered to private companies (operators not designated by a UPU member country under article 2 of the Convention). However, this practice was suspended in 2007. |
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