3 questions about e-Newsletter

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Friendly Neighbour

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Q 1. Can Super Admin of a WPMU network offers sub-site admin this e-newsletter plugin, and ask them all to use : Amazon Simple Email Service (Amazon SES)

http://aws.amazon.com/ses/

Following post that said the plugin works with Amazon, but it doesn't say if it for both main site and sub-sites or just main site only.
http://premium.wpmudev.org/forums/topic/could-e-newsletter-be-modified-to-work-with-amazon-simple-email-service#post-148422

Q2. If every sub site admin uses Amazon SES to send newsletter out, will the website hosting company (hosting the WPMU network) has a problem with it? Is this what you called "open relay"?

Q3. If all above is fine, could my WPMU network website be labeled as spam site assuming all sub-sites all use Amazon SES and a few "bad" sub site admin just act like spamming? (Once we offer it to sub site admins, you never know what people will do with it.)

Thanks!