Per the USPS website, service to Australia and the following countries is currently suspended due to COVID-19 and other service disruptions:
Afghanistan, Australia*, Bhutan, Brunei, Cuba, French Guiana, Guadeloupe, Loas, Libya, Martinique, Mayotte, Mongolia, Reunion (Bourbon), Saint Pierre and Miquelon, Samoa, South Sudan, Syria, Tajikistan, Timor-Leste, Turkmenistan, & Yemen
These service disruptions affect Priority Mail Express International® (PMEI), Priority Mail International® (PMI), First-Class Mail International® (FCMI), First-Class Package International Service® (FCPIS®), International Priority Airmail® (IPA®), International Surface Air Lift® (ISAL®), and M-Bag® items.
*Australia’s service disruption affects Priority Mail International® (PMI), First-Class Package International Service® (FCPIS®), Commercial ePacket (CeP), International Priority Airmail® (IPA®) packets and International Surface Air Lift® (ISAL®) packets only.
Unless otherwise noted, service suspensions to a particular country do not affect delivery of military and diplomatic mail.
We apologize for the inconvenience and hope that these issues are resolved as soon as possible. Please see this link for more information and updates.