Look for 'subscription form' or 'subscription widget' or even 'lead capture' https://documentation.mailjet.com/hc/en-us/articles/360042502194-Subscription-Widg

Look for 'subscription form' or 'subscription widget' or even 'lead capture' https://documentation.mailjet.com/hc/en-us/articles/360042502194-Subscription-Widget https://documentation.mailjet.com/hc/en-us/articles/36004250... https://sendgrid.com/blog/building-a-sendgrid-subscription-widget/ https://sendgrid.com/blog/building-a-sendgrid-subscription-w... https://gleam.io/app/capture/mailjet https://gleam.io/app/capture/mailjet The email addresses end up in their database but you can download the list there. They make money from people sending regular newsletters, that's optional though.