Unless you are planning to become a full time mailer, you're better off going with an ESP and doing a simple fire and forget.
They will have white listed IP's typically, and be able to inbox better than trying to do it all yourself in-house unless you are actually going to spend the time and effort to learn how to handle it all properly. Just make sure that your list is DOUBLE OPT-IN and CAN-SPAM compliant. Otherwise, you are going to have problems.
Good luck chief.
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Should You Email Your Members?
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Enough Said. 
"Would you rather live like a king for a year or like a prince forever?"
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