With parcel volumes already setting records this year, December is tipped to surpass last year's 52 million parcels.
Australia Post's Gary Starr said preparations for the peak season were well underway, including the recruitment of more than 4000 Christmas casuals.
"We're seeing record parcel volumes with more than 5.9 million households shopping online a month – that's more than half of all Australian households, and it's showing no signs of slowing as we head into the online sales season and Christmas," Mr Starr said on Thursday.
There will be extra air freight capacity, weekend deliveries and thousands of new staff to ramp up delivery services and parcel sorting with deliveries arriving right up until Christmas Eve.
Parcels should be posted by December 13 for Parcel Post or December 20 for Express Post.
However, for some locations, including Perth, Darwin and others outside of metro areas, it's recommend parcels be sent earlier with customers advised to check the Australia Post website.
Christmas cards should be sent by December 16, and customers sending overseas are encouraged to do so as soon as possible as cut-off dates vary depending on the destination.