I have come to the conclusion that for a long time my BT Yahoo emails have been hacked. :/ No idea how/why/what but countless times I've had "failed to login" on the my mobile android client and when I try getting email on the PC it says "too many failed attempts"... and so I assume someone tried brute forcing it (or cross site pollination password leaks... it was an OLD email account from when I was still a kid).
But that they have been known to have been hacked/phishing/leaked details in the past, it could be down to that.
I know that I occasionally get emails supposedly from a friend and a family member, that look like they have come from their yahoo account (that they both ditched after the big "hack a while back). Phishing or scam usually.
Annoyingly they address me by my first name and look like they have come from Yahoo, but a check on the source shows otherwise. Usually from Russia.
Worrying isn't it?
It's been known about for over two years but only admitted as such in the last couple of months. Yahoo was hacked.
I know BT used Yahoo. I think Sky did too.
Check your email on this site and it will soon tell you if that email address is circulating
https://haveibeenpwned.com/
I found out on there that one of my old gmail accounts was hacked after the Adobe fiasco a couple of years ago
A thanks for that link... 3 sites I may have used... um... DID use way back when (probably back in college) did get pawned... I think I may have also used the same pass back then. It's a "burner" account anyhow, and seems my personal one was not hacked (off general use sites).
But only because I was able to unlock it from being blocked through login attempts, and finally got the password changed.