Parcel delivery giant DPD has temporarily stopped delivering to a number of Merseyside postcodes.
The company said there will be delays to its next-day delivery service because of the industrial action.
According to DPD, there will be delays in delivering parcels to the affected Merseyside postcodes of one day.
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Royal Mail workers staged a fresh strike on Sunday, December 11, in the long running dispute over pay, jobs and conditions.
Members of the Communication Workers Union (CWU) are embroiled in an increasingly bitter row which has sparked a serious of walkouts.
More strikes are due to be held in the run-up to Christmas, which the union said will cause a huge backlog of mail. The next strike day is expected to take place on Wednesday, December 14.
A DPD statement said: "We are experiencing short delays to our next-day delivery service in a small number of locations, as a result of the industrial action at the Royal Mail, which has had a huge knock-on effect across the entire industry.
"As a result of the industrial action, we have seen an increase in demand for our services, as shippers seek alternatives to the Royal Mail in the UK.
"While the service is unaffected in most areas, we have today temporarily suspended next-day deliveries to around 5% of postcodes in the UK. The expected delays of 24 to 48 hours and the postcodes impacted are shown on our website.
"Where delays do occur, we update the parcel recipient directly where our customers have provided us with their contact details.
"Any delays at this time of year are hugely regrettable and while the underlying issues here are outside of our control, we would wish to reassure retailers and parcel recipients that our team is doing everything possible to minimise the impact on next-day deliveries."
The affected postcodes are:
- CH25-34
- CH41-49
- CH60-66
- L1-37
- L67
- L69
- L71-75
- L80
- L38 0-L38 1
- L38 3-L38 9
- L68 0
- L70 1-L70 2
- L70 8-L70 9
- PR8-9
- WA9-12
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