Plaxo somehow sending dupe emails?

I'm using Outlook 2003 w/ Plaxo on an Exchange 2000 mail system. Sometimes when I send an email to more than one person and hit send, 2 to 4 duplicate messages are sent to my recipiants. What could be wrong? /images/graemlins/confused.gif

Is this when just sending a message using Outlook? Plaxo does not affect the sending of e-mails, so it is likely that this is either a temporary problem or something involving the configuration of your e-mail system.