POST Office staff alerted the police about a suspicious package — which on investigation contained Class A and Class B drugs.
Isle of Wight Police hailed the "fab community work" from their Newport Shopwatch scheme, which helped lead to the arrest of a man suspected of being involved.
A spokesperson said: "On Wednesday we were notified by Post Office staff about a suspicious package which they believed did not contain what it should.
"We attended and sure enough that package contained drugs which we believe are Class A and Class B.
"It transpired these had been sold from the Island and were heading to the mainland.
"Needless to say we made sure the parcel never arrived.
Read more: Police operation targets Class A drugs at Royal Mail
"We arrested a Newport man for being concerned in the supply of drugs which have been sent off for testing.
"We carried out a premises search where we recovered further items related to this incident.
"If you have a business in Newport and are keen to join the Shopwatch scheme we can point you in the right direction."
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