Have I Been Pwned?

If you have an email address then this is a great website to check whether it’s safety has been breached.

Basically, you enter your email address and the website “Have I been pwned” by Troy Hunt will check it against the current list of data breaches.

If you’re still not sure you can read more about it on Wikipedia:
https://en.wikipedia.org/wiki/Have_I_Been_Pwned%3F

I recommend giving it a go, it might remind you of some long forgotten accounts, it did for me!