Hello
I have this sporadic problem on a computer running Vista Home Premium and
Outlook 2007. Occasionally, when I send an email to an address I have used
frequently, I will receive a message that the email was not delivered
because the "destination computer was not found." This occurs randomly to
some Yahoo acounts as well as some where the ISPs name is part of the
address. My software is up to date as is my A/V software. Additionally, the
undeliverable message arrives as much as twelve hours after sending the
email. Sometimes, but not always, a new message to the same address goes
through.

Thanks

Harmon