The union representing Tasmania's postal workers says there is still uncertainty around staffing and whether any postal centres outside of Hobart will change to delivering letters only on alternating days.
The government has proposed limiting letter deliveries from metro centres to every second day until mid-2021 due to COVID, however the only Tasmanian post offices deemed "metro" were in Hobart, based on 1990s population calculations.
The Communications, Electrical and Plumbing Union feared job losses, prompting Australia Post to sign a memorandum of understanding to protect employee conditions under the changes.
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But CEPU Tasmania secretary Michael Anderson said they had received no detail about what that would mean for services in Tasmania, and staff were still concerned about their jobs.
He said the way the changes were explained was "an insult" to postal delivery staff.
"The thing that created alarm for our members statewide was a manager in the North and North-West running workplace meetings saying one in four posties was going to go," Mr Anderson said.
"The workload has not decreased at all during COVID. Photographs from Tassie postal centres suggests there's still plenty of mail being undelivered due to staffing issues, and parcels are picking up any shortfall."
Australia Post is still determining which postal centres will be subject to the changes, a spokesperson confirmed, which include moving some posties from bikes to vans to cope with increased parcel deliveries, and increasing delivery time for intrastate mail to five days.
The proposed changes were welcomed by the Australia Post Licensee Advisory Committee's Tasmania branch, with chairperson Kelly Eckel - of Woodbridge LPO - saying a shift in focus is needed from letters to parcels.
"Letters have definitely declined in the nearly 10 years I have owned a post office and the nature of my business has changed from mostly a letter service to a majority of parcel delivery service," she said in a submission to a Senate inquiry.
The changes are being analysed by a Senate committee.