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> Or do I need to obtain explicit consent to add to a mailing list?

Yes.

Is emailing them back then and asking them to add them an ok practice?

Yes, I use something like.

Awesome, thanks for emailing .... talk about things they talked about ...

Also, I'm starting up / have a product focused mailing list for updates, features, and other closely related topics, no sales.

Can I add you to this list? I also have a separate one for sales and deals if you would like to be added to that as well.

(Notice the ask starts a new para)