Hello @PeterT ,
The difference between Express and Implied has more to do with GDPR and CASL compliance. If a contact writes their email address on a physical sign-up sheet, then that would indicate an expressed interest, even if it wasn't included among the examples in the permission policy article linked.
If your account requires a list review, or an account review, then the difference between implied and expressed will come into play, based on the contacts' source and your own records. If you're particularly concerned about your contacts' permissions, it may be best to speak directly with our review team.
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