You shouldn't attach more than 10 people to anyone given message as it will be considered spam. even if you use the bcc field your still going to get caught up in SPAM filters and most likely get your IP address band. Your best bet is to use a loop and send 1 message to each person using the TO field. Also, to comply with CANSPAM you need to suggest a means for the person to unsubscribe from your e-mail and also provide your physical mailing address on the bottom of the e-mail. If your going to send an HTML message I'd also recommend that if you do send your mail that you send multi-part message and provide a text version to go along with the html.
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