Back when it was free for Hotmail to check your POP mail for you (Google says 2002, wow), I set it up to check my ISP email account. Not so long after, the option went paid-for --
It has long puzzled me as to what exactly Hotmail did to my email, as the POP emails have continued coming to my Hotmail account for years -- even after I changed the password on the Hotmail account. But it never really bothered me enough to figure it out.
Then, today, I found that I'd not checked my Hotmail account for a month, and so it'd been deactivated, and everyone who sent me email to my ISP POP account was getting bounce messages. But the bounce messages weren't coming from Hotmail -- they were coming from my ISP.
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"Aha!" I say to myself. It seems obvious that all those years ago, Hotmail changed some kind of setting on my ISP's mail server, telling it to forward emails to the Hotmail account ("and they have the audacity to charge people for that now?", I ask myself).
And so we finally come on to the question:
How on earth do I turn this off? I assume there's some special code I have to somehow send to my ISP's mail server, but what is it?