Royal Mail is warning of delivery disruptions in 47 of its delivery offices across the UK due to staff absences.
The postal service has said workers having to self isolate and high numbers of staff off sick are affecting deliveries.
"Resourcing" and "other local factors" have been attributed to the delays.
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As a result, people living in certain UK postcodes - a number of which are in Merseyside - will see deliveries disrupted.
The news comes after many people have reported not receiving post in different parts of the region, over the past few months.
Earlier this month, one St Helens woman told the ECHO she hadn't received any post for "almost four weeks" and had been expecting a letter which was posted at the beginning of December.
Despite a number of issues, Royal Mail reported a £311m pre-tax profit in the six months to September 26, 2021.
On its website, Royal Mail said deliveries are "operating as normal across most of the country" but that it may "not be possible" to deliver to addresses in some postcodes across all six days of the week.
The postcodes affected are:
- Amersham DO (HP6, HP7 and HP8)
- Amesbury (SP3 and SP4)
- Barking DO (IG11)
- Bicester DO (OX25 to OX27)
- Bredbury DO (SK6)
- Bridge Of Don DO (AB22 and AB23)
- Bristol South DO (BS3, BS13 and BS41)
- Burgess Hill DO (BN6 and RH15)
- Caldicot DO (NP26)
- Camberwell (SE5)
- Cramlington DO (NE23)
- Cricklewood DO (NW2)
- East Dulwich DO (SE22)
- Erskine DO (PA7 and PA8)
- Gerrads Cross DO (SL9)
- Golders Green DO (NW11)
- Hanwell (W7)
- Havant DO (PO9 and PO10)
- Herne Hill DO (SE24)
- Hitchin DO (SG4 and SG5)
- Holloway DO (N7)
- Hornsey DO (N8)
- Hoylake DO (CH47 and CH48)
- Islington DO (N1 and N1C)
- Larkhall DO (ML9 and ML10)
- Maida Hill DO (W9)
- Manchester South West DO (M15, M16 and M32)
- Muswell Hill DO (N10)
- Newton Mearns DO (G77)
- Northwich DO (CW8 and CW9)
- Perth DO (PH1. PH2 and PH14)
- Peterlee DO (SR8)
- Pontefract DO (WF7, WF8, WF9 and WF11)
- Redcar DO (TS10 and TS11)
- Rotherhithe DO (SE16)
- Rottingdean DO (BN2 and BN51)
- Swindon West DO (SN5)
- Thame DO (OX9 and OX39)
- The Hyde DO (NW9)
- Upminster DO (RM14)
- Upton DO (CH30 and CH39)
- Wallasey DO (CH27, CH44 and CH45)
- Wantage DO (OX12)
- West Norwood DO (SE27)
- West Wickham DO (BR4)
- Willesden DO (NW10 and NW26)
- Wootton Bassett DO (SN4 and SN16)
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