Isle of Man Post's 'Pricing in Proportion' system will come into operation on 21st August.
The change means customers' letters will be priced by size as well as weight.
However, it's expected the cost of sending most letters will remain unchanged or possibly decrease.
Isle of Man Post's Sales and Marketing Manager Lisa Duckworth says people will be fully informed as to the changes:
(Picture: Letter sorting machine at Post Office Headquarters)
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