Key Points 

• You will need to verify your domain before sending out emails 
• Your domain has a sender score
• Use Mailerlite (compare with Brevo)
• Mailchimp charges for unsubscribes 

Mailerlite [Affiliate] - https://www.mailerlite.com/a/6K95GNejWHMV

Substack - https://substack.com/

Test your email sender score - https://www.mail-tester.com/