TPG made a big boo boo today when it accidently revealed hundreds of its business customers e-mail addresses in a billing e-mail that was sent out today.

ZDNet Australia was given the heads up about the error from several of TPG's business customers earlier this afternoon which expressed concern over privacy breaching.

The e-mail sighted by ZDNet appears to have been sent out to 500 addresses simply advising their business customers that their bill was ready for viewing.

TPG is yet to respond in relation to this error.