I have a mystery that I hope someone can help me easily solve and correct.

Ocassionally, with no particular e-mail, plain text or with an URL in it, our e-mail will trigger a virus warning to the person the e-mail is addressed to stating that I have tried to send them this --- "The Virus Scanning software on iclub.org has reported that E-Mail
address [log in to unmask] attempted to send you an E-Mail containing the
"[Outlook 'Long Filename' Vulnerability]" virus in the "  -- whatever e-mail .
I can immediately send the same e-mail again and it will go thru fine. Our ISP has no answer, and says ours is the only one that ever does this.
        We are using Win 98, Netscape 7.1, Netscape for mail from I-club,  and Norton Antivirus software. Update Norton daily, and run Housecall weekly also.
This sure scares the receiver of these e-mails, Why is it happening, and/or where can I start looking for the answer.

Any ideas as to why this happened and how I can get it to stop , please ????? Thanks  John

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