Do you have an anti-virus program running? Some viruses send bulk emails.
I keep getting messages telling me messages which I haven't sent and know nothing about cannot be delivered.This morning I got another one beginning
"This message was created automatically by mail delivery software.
A message that you sent has not yet been delivered to one or more of its
recipients after more than 8 hours on the queue ..."
Further down it says
"The subject of the message is: RETURNED MAIL: SEE TRANSCRIPT FOR DETAILS"
The given email address for the message I'm supposed to have sent is from a non existent website.
It also says
"Delay reason: lowest numbered MX record points to local host"
Any ideas what's going on?
I'm using OE6 on XP by the way.

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