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hey mate, i think the best practice would be to send the emails with a short delay after each contact! Even with ten contacts if 20 users do it at the same time the hosting company might see it as spam. Not sure how long would be the optimum delay time though!I would love to help as i can with it though! There is a php script which include functions for gmail, aol, yahoo etc to grab the contacts i could try and find it if you think it could be useful to you. I think its called contact grabber.
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