@crocusfour
I doubt you were hacked as the way these people get access is when someone has in error given their details via a scam
email that was sent to make it like it was from Sky.
As for your issue give this a try:
Login to your online account:
https://skyid.sky.com/signin/email/
Go to Settings > More Settings > Filters and remove anything that you did not setup.
Then go to Settings > More Settings > Mailboxes > Your email address > Reply-to address
And again remove anything here that you did not setup.
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