About 15-hundred mail carriers fanned out across Colorado and Wyoming yesterday making a rare Sunday delivery.
Today, about 500 carriers will be making an even rarer Christmas delivery of thousands of storm-delayed packages.
Postal Service spokesman Al DeSarro calls it an unprecedented effort.
A blizzard dropped up to three-and-a-half feet of snow on Colorado and Wyoming last week, disrupting mail service amid the Christmas delivery crunch.
The storm also shut down roads, businesses, schools and airports -- including Denver International, the nation's fifth-busiest.
DeSarro says hundreds of thousand of packages arrived at post offices in the two states in the last three days.