The fundamental idea is to give people something that aligns with the type of subscriber you seek. For example, if you wish to have a list of SciFi readers, a free SFF short story, book, or character dossier would be very appetizing to the sort of people you wish to attract. It can’t be something they can get from anywhere (like an Amazon gift card) but instead something genuine that you have created.
What I like about Mailchimp is that you can setup autoresponders such that only a subset of your email list will receive your follow-up emails based on when they signed up for your newsletter. For example, if I only want recent subscribers from the last month to receive one of my autoresponders, I can simply specify this using MailChimp’s autoresponder interface.
Finally, you can optionally include “automations” with your broadcast. Automations are a simple way to automatically add or remove tags when your subscribers do certain actions, like open the email or click on specific links. Adding and removing tags are important when creating segments, or subscriber groups, and triggering automated email campaigns.