You can manage your Bible Gateway e-mails by clicking on one of the links at the bottom of any email from biblegateway@e.biblegateway.com as shown in the screenshot below:
Add or remove specific individual subscriptions by clicking the "Manage all Bible Gateway subscriptions" link or you can choose to stop any and all emails from Bible Gateway by clicking the other link.
If you need to change the email address associated with your subscriptions, please email support@biblegateway.com.