I'm pretty savvy with emails and not opening anything I don't know, Never opened an attachment from anyone I don't know work wise etc. But today somebody on Windows said every time I email them my Mac is sending a virus, and is being blocked by Norton, he did say something about it telling them it's phishing etc... which i thought was different to a virus. Could I have picked anything up without knowing? How do I know if it is and what can I do to check why? Obviously, nothing seems different to me on here?