One thing to note that if your wanting a mailing list manager to also tell you if people received them then you will always have rejected emails from places like hotmail and yahoo. Most mailing managers use a tracking image inside the body of the email which of course the recipient opens and it calls the image from your server. Most free email sites and spam guards use this as an identifier to mark them as spam.
With reference to mailing list managers "phplist" has always done dozens of my friends and i fine for years and many many functions/subscribe/unsubscribe etc.
Have a look for it on google and have a play.
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