How accurate is this site though, i have used it in the past and it seemed good but whats the accuracy like?
Haveibeenpwned is pretty neat for checking breaches. Regarding accuracy, what is your idea of accurate here because there will be factors to say that it is accurate.
These sites pretty useful, I use haveibeenpwned for all my e-mails, pro tip for email security if you do not want it to be compromised, do not use your personal/business when you are suspicious, always use a throwaway email.