There are a few specific options you may be interested in while creating a campaign.
Include some user identities info in subscriptions
Allow the campaign shows in register form
Allow guest subscribe: This option allows you...
Description: Allow users easy to subscribe or unsubscribe newsletter through Sendy.co
Support subscribe/unsubscribe on register page
Includable extra fields when subscribe (gender, birthday)
Handle when user change email. When user changed to new email, and the old email...