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Is it an issue that those email addresses never opted in to receive the first email?
As long as you procured the email addresses from an open source, and not through illegal means, and as long as you provide an opt out functionality in the email, then you are within the accepted legal bounds to conduct this operation.
As I understand it, this will be a one time email, allowing for opt in/opt out. That is the best practice and something that should surely be implemented in this effort. Otherwise, you could run afoul of some anti-span regulations and laws.
Let me know if you have any other questions or comments.
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Best wishes going forward!
That is considered open source and therefore legal to send one email, which allows you to either opt in or opt out. I would send no more than one email for the purpose of "fishing" though.
That is correct because they have made themselves open source.