Email used only for this site hacked

I have changed my pwds etc since but the ONLY website on which I used a particular email was this one and someone accessed it from China. Just a heads up.

Not sure if this is right forum, redirect if not.

Can you elaborate ?

Did they access your email via this site, or just that particular email server ?

My email account was also recently hacked.

Probably a coincidence.

This is probably really thick but how does such hacking show up?

Sometimes all your contacts suddenly get bombarded with spam from you.