Any good site for e-mail marketing?

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I am looking for a good and reputed site for e-mail marketing. Something like over 1 lac members and we can try it out for free, and then if interested can upgrade the membrship. I have heard that there r some sites where we can LEGALLY send over 1 million mails to ppl - WITHOUT SPAM. So, I am looking or sething like that. WOuld be good if someone can also tell me details like if he has tried the site n his experince etc. Thanks.