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1 year ago99% this is probably what’s happened. Aussie by default blocks incoming traffic on the usual ports (25, 80, 443, etc.) but will happily remove the block if you give their support team a call and explain why you want the block removed.
There’s also an option to remove it in their app these days as well I believe. Go to Service Tests -> Port Blocking and you can disable it from there.
One could say you must seize the means of reproduction.