Yep it pays to be suspicious about anything like this (ie unsolicited contact). I deal with a fair amount of spam issues (referrer, email, blog comments etc) everyday, so you get to recognising unlegit stuff or scams and so on pretty quick; but even so there are always some that cause you pause and you have to check out (ie Googled) if you can before deleting etc. So you just have to be cautious really.

Mind you the phone ones won't work with me as I never answer the phone.

Thanks for the heads up Frank.

Regards

Su