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Most hosting providers will not allow you to send bulk email out from a VPS - they have fair usage policies and if you end up sending too much out it may result in the VPS being throttled.
My suggestion is that if this is legitimate subscriber mail to go through an email website like campaign monitor, dot-mailer, mail chimp or other numerous sites that I could mention. This facility caters for all the permissions needed.
Sorry that there is no other useful information I can give