Mass Mailing/Marketing - bypassing spam

I want to do mass mailing to many contacts. So the question is, how marketing module works when it needs to send loads of mails? Will it be blocked as spam by sending too many messages at a time or does it send messages in some intervals? Like 50 messages every 30 minutes or something like that?

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Ricardo Martins

Nice question... I would also like to know whats the best way and parameters we need to configure so that the server can handle lots of mails sent and not be flaged as spam.