If that's what the email looks like, then they are probably targeting people whose account name and email is known. Likely because they reuse signup information on other sites.
This information is probably on a list somewhere and anyone getting such an email should expect further phishing emails.
I suggest using multiple email accounts. I use three -- one containing my real name for real-life correspondence or online accounts I would provide personal information for, one for online accounts I care about or important online correspondence, and one for online accounts I do not care about. This way, if my "online" email is compromised (more likely to happen on a random webforum, like for instance
), my important personal email isn't revealed.