"The integrity of the mail is of paramount importance and it is a fundamental principle that mail should be delivered as addressed without delay or interference,subject to safety and other relevant protocols being adhered to."
Mr Macdonald said in the circumstances,it was necessary for them to notify their customer,Pauline Hanson,of the delay.
Ms Holgate and several senior Australia Post managers were copied in to the written warning,sent from Mr Macdonald to council chief executive Justin Hanney.
Australia Post sources familiar with the tense stand-off over the delivery said Ms Holgate also personally pushed for the delivery of the parcels to the residents of the tower block in exchanges with the council.
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An Australia Post spokesman said Ms Holgate had not spoken to Senator Hanson or One Nation directly prior to authorising the email.
In a statement,Mr Hanney said the council had responsibility for overseeing the receipt and distribution of essential supplies to residents in the North Melbourne public housing estate.
"The City of Melbourne consulted with Australia Post and also sought advice from the Federal Police about whether the delivery breached the Commonwealth Criminal Code,"Mr Hanney said.
He confirmed the council requested Australia Post collect the parcels and they were not distributed.
In a statement on Tuesday night,an Australia Post spokesman said it took its obligation to deliver mail as addressed"seriously"and"given the unique nature of the circumstances"delivered all mail to authorised officers at the site control centre.
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"Upon subsequently being made aware that the items did not reach their ultimate destination,we raised it with the City of Melbourne and engaged with the sender in good faith to resolve the matter,"the spokesman said.
In April the Morrison government granted temporary regulatory relief requested by Australia Post to allow letters to be delivered in metropolitan areas every second day,rather than every day,remove priority mail product and extended delivery time for intrastate letters to five days.
A month later the federal opposition announced it would seek to overturn the changes in the Senate with the support of the Greens. The disallowance motion,which is still to come to a vote,needs four members of the five-person crossbench to succeed.
The Sydney Morning Herald andThe Age revealed in July that Ms Holgate and her executive general manager Sue Davies had flown to Brisbane to give Senator Hanson a tour of its Brisbane distribution centre.
Senator Hanson's spokesman,James Ashby,said on Wednesday the parcels had been"dealt with"and"delivered". When asked who had requested Australia Post issue a legal threat to ensure they were delivered,he replied:"I'm unsure."
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Ms Holgate,who earned $2.7 million as the nation's highest-paid public servant last year,is also the federal government-appointed chair of the Australian-ASEAN Council Board,which aims to promote Australia's interests in south-east Asia.
She has come under fire in recent weeks for attempting to convince Australia Post's board to pay out more than $7 million in bonuses to executives despite declaring in March she and her senior colleagues would waive any right to bonuses because of the COVID-19-induced economic downturn. While the board eventually rejected the about-face,Ms Holgate was paid a deferred bonus of $277,000 from last financial year.
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