What method are you using to send emails? Is this inviting a friend directly (clicking on their picture) or using the "Invite by Email Address" feature at the bottom?
Some people are confused that when you do the first (inviting people already on Facebook) that it sends it to their Facebook home page as a notification and does not send an email.
If you still have issues, try it on our demo page and see if you still experience issues and let us know.
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