I just ran the ideas for stopping worms by one of my sons who is an internet-related employee (can't remember his job description!) of a software development company in Toronto and he says, re the !000 idea, "I suspect that that will block only dumb worms. Some have entirely their own methods for sending email and one bad address is unlikely to stop them. Linux is the answer." The Linux system does not seem to have the problems that Microsoft has with viruses, he likes it for other reasons too, has used it for years, and reminds us , as he does above, when the rest of the family has problems! But at least, if not all worms can be stopped by using the !000 method, maybe some can, and by using the undeliverable mail tip, you will know that you have one. Lilian