The Post Office is asking people to be patient as it tries to collect and deliver mail this week.
On Facebook, it says it faces problems during TT Race Week because of race schedules and road closures.
The organisation says it's doing its best to reach all areas as soon as it can.
But it's asking people to be patient during the disruption.
Special healthcare recruiting event this summer
Date set for flagship maritime industry event
14th Aviation Conference takes place this week
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Total of 70 ships and companies sanctioned over Ukraine war
New stamps celebrate Island supercar culture
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