Australia joined on Tuesday a string of countries suspending some postal deliveries to the United States, citing a "complex and rapidly evolving situation" with US President Donald Trump's looming tariffs.

Australia Post said most goods being sent to the United States and Puerto Rico would no longer be accepted "until further notice".

Gifts with a value of less than US$100, letters and documents were exempt from the suspension.

The move follows similar steps taken by other postal services and mail carriers including in Austria, Belgium, Denmark, France, Germany, India and New Zealand.

Taiwan also announced it will stop sending merchandise-type mail to the United States from Tuesday.

The Trump administration has said that as of August 29 it will abolish a tax exemption on small package

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