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You could send out an invitation to your own friends list, and it probably wouldn't be recorded as spam. But it sounds like you're going to be scanning your friend's contact lists and sending out invitations to them, where they may or may not know you, and so could record it as spam. The only way to be sure that they think it's from a friend then would be to spoof the original email you scanned, which is a huge no-no.
I'm not trying to sound accusing here becausse I don't think you're planning on doing anything bad, but this is just how it looks from an outside point of view. I know that by making this post, you care about how your actions will affect your server, so I don't think you'll do something that could blacklist it.
If you don't get a clear answer on how this will affect the server load from someone else, you should email support and show them the script you're planning on using (a link to the site, official description, something like that) because they'll be able to tell better then anyone how it's going to work.
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