Inviting friends by email, they never show up

Ive invited over 7000 friends via email, but they never show up in my sent invites, well 1 or 2 do, and I know most of these are genuine emails, any idea what the problem is?

Cheers

Either your list is full of people that aren't on Facebook, or they're WATCHING YOU! I'd really just scrap that account and move to another one. Try to limit the amount of people you invite at once to maybe a couple hundred or so and see if it helps. I personally never do mass invites because it eventually leads to problems down the line if you want to use any other kind of automation on the account.