I would also like to add my twopennyworth here.
Recently I have had a couple of e-mails purporting to be fron BT saying that my payment hasn't cleared.
The e-mail addy looked Kosher...it was from e-billing at BT....but when I went into the e-mail to check, my security system flagged it up as a risk and prevented me from going further.
I send such e-mails to
[email protected] so that they know what is going on.