Hello @Forespar ,
Generally speaking, as long as its stated that they may be reached out to for marketing or similar communications prior to a contact submitting their info, then you should be okay. I'd recommend going through our Email Permissions Policy to be safe though.
Since large amounts of unsubscribes and spam reports can damage our sending reputation and impact delivery, our Review systems may trigger after certain levels of such occur for an email sendout. For an overview of account, list, and compliance review elements, I'd recommend taking a look at our Community's Review FAQ.
Ultimately for any of this, you may want to reach out to the Review team directly, to get more advanced insight on the permissions of your sendouts.
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