One thing to keep in mind, is that weather they joined your site or not, weather they agreed to get the mail or not, if they complain, then it is SPAM. so be really careful with this.
Is it worth it??? Back in the day I had a triple opt in mailing list. I collected and mailed myself. out of 1000 sent more than 3 hundred would be opened, and out of that I would say we did 30 to 30 sales.
we mailed 4 times a day to more than 300k people.
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