The Swiss Post says it delivered up to 20 million letters on peak days in December, double the normal daily average in 2010.
Despite the growing popularity of online services, including text messaging and social media websites like Facebook, the Swiss Post said it expects only a two per cent decrease in the number of letters handled in 2010.
There had been a 4.9 per cent drop in 2009 compared to the previous year, and some officials have forecast a 30 per cent decline by 2015.
The Swiss Post also said it transported 15 million parcels between December 1 and 24 this year, which also represented a doubling compared to the average for a similar period in 2010.
This Christmas the Swiss set a new record for the amount of text messages sent. The three main mobile phone operators, Swisscom, Orange and Sunrise, reported that 73.6 million were sent on December 24 and 25 - a seven per cent rise on 2009.
swissinfo.ch and agencies