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I have POS system that I can export the email addressed from. Having "unsubscribed" LIST is very nice, so that I re-import the emailAddress from Excel over and over again, without worrying on accidently to send to the customer that do not want to receive email.
Another LIST for "bounced" LIST will also very nice, so that I will not to worry about adding the emailAddress that are not necessary while syncing my POS system with ConstanctContact.