Thousands of extra deliveries have been made by postal workers as the Royal Mail made strenuous efforts to clear the huge Christmas postbag despite the snow.
Up to 14,000 extra delivery rounds are planned across the UK, weather permitting, over the next four evenings.
Around two million homes should receive an evening delivery this week.
The delivery programme follows £20 million investment by the Royal Mail in additional measures to deal with what is already the most severe December weather in almost 30 years.
Mark Higson, managing director of Royal Mail, said: “We are planning up to a total of 14,000 additional delivery rounds on Monday, Tuesday, Wednesday and Thursday evening, weather permitting.
“We have had postmen and women on the streets for the last two Sundays in a row. Royal Mail is committed to doing everything possible to deliver letters, cards and parcels on behalf of its customers.”