It's unlikely that an email account was hacked. It's far more likely that the information was obtained by hacking data from a company that you've traded with (or even bought from them, if it was a rather dodgy trader). After all, most people you send emails to probably won't have your landline phone number, whereas traders often ask for a contact phone number, so your name, email address and phone number will all be stored in the same place on their servers.