For some strange reason, if someone sends out an email from one of my 4 blogs' contact form, I get 6 copies of the sent email. I've tried most Contact Form plugins and the same thing happens. I've changed the destination email to a Gmail account and ditto.
I thought my mail server was at fault but I sent myself messages from 2 SMF, 1 UseBB and a Drupal install and only get one copy. Also, everything works as it should when using my desktop email client to send myself emails.