It said: “We aim to deliver all addresses we have mail for, six days a week.
“If resourcing issues, associated self-isolation and safety measures prevent this, we’ll deliver at least every other day.
“It’s only in extreme cases – where offices are severely affected by absence levels – that this may not be possible.”
Postcodes affected this week
Cannock (WS11 and WS12)
Orton Southgate (PE2, PE7-PE9)
St. Albans (AL1-AL5)
Customers can sign up to get live updates via email from Royal Mail.
It also shared changes to its collect service for those who have received a ‘Something for you’ card.
Britons can check online for the latest opening hours and rules for picking up a parcel at their local branch.
Those who do not have missed delivery cards should not visit these points.
Delays only affect some areas of the UK and Royal Mail constantly updates customers of any changes.