post https://api.g001.enterprise.ipost.com/v1//lists//md5add/
Add one or more Contacts to a MD5 Suppression List
MD5 Suppression Lists are a specific type of suppression list that converts uploaded email addresses to a MD5 hash upon upload. The MD5 Suppression List functionality is case sensitive as it preserves upper/lower case letters in the email address when they are hashed. As a result, it will only suppress email addresses from the sending list if the case of the email addresses match.