Built products worth $ 20 MM in the E-commerce, Email Marketing and payments fields. All Internet.
I've built one of the biggest email marketing platforms on the planet: https://moonmail.io
I'm the second person in the world when it comes to Shopify merchants using my Apps. I know the Shopify roots and the Partners & Apps world like no one does. I'm a Shopify investor and have been with the Most Popular Ecommerce platform since 2009.
I'm probably the most reputable Amazon Consultant within Europe. Author of the first "how to Amazon book" within Europe: "Skyrocket your Amazon Sales" https://www.amazon.es/Multiplica-tus-ventas-con-Amazon-ebook/dp/B01N45V979
I can guide you through all the process which involves selling the right way in Amazon Europe.
There's quite a few in the market. Some are really expensive and most of them use the same techniques. I'd highly recommend to try MoonMail's tool which is pretty simple, straightforward, though you can only upload lists of recipients of up to 250 emails. https://moonmail.io/email-verification-email-list-cleaning/