How to handle a 100k + email list?

Hey!

Let's say I have a 100k+ email list from a gadget e-commerce website and all of them are buyers.

How can I start sending messages to engage them? Any suggestion?

I thought of creating a landing page of the coolest gadgets with Amazon associates link. Is it a good idea?

Is considered spam if you email them with a link to your landing page?

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