"We have to find a way to not only have better control over who we receive e-mail from, but also to authenticate or trace the e-mail, " says an executive for a major brokerage firm, who asked not to be named.

CNN: Stopping the next Melissa

John Tudor and Son has now reopened and maintains no trace of E.coli has ever been found there.

BBC: NEWS | UK | Wales | South East Wales | Council release food report order

And a member of his staff supervised that personally to make sure that that happened, leaving no possible trace of e-mail evidence or other what - other things that he left behind.

NPR: Does Arkansas Still Heart Huckabee?

Liz's body is missing, and there's no trace of the misdirected e-mail.

FORBES: Killers With Green Eyeshades

These include closer co-operation between national intelligence agencies, the creation of an EU counter-terrorism chief, and measures that make it easier to trace terrorists who use mobile phones and e-mail.

ECONOMIST: An explosive relationship | The

As police could find no trace of the doctor they began to suspect that the e-mail was malicious.

BBC: Stalker had sophisticated cyber plan

Cottonseed oil is also the primary input in the production of Olestra, a frying fat that glides through humans without leaving a trace of fat or calories, and is also an important source of vitamin E for pharmaceutical producers.

NPR: Texas Cotton: 'Farmer Profits at Every Step'

They use false details or hide behind anonymous e-mail addresses when signing up, and are almost impossible to trace.

BBC: Fake websites shut down by police