Returns a list of all recipients in a suppressed state. This includes email
addressses which are not receiving email because they are having temporary
problems, such as mailbox full, mail server not responding, as well as those
that are more permanent in nature, such as account deleted, or spam reports
from the recipient.
Access to the PostageApp API requires an account and API key.
You can use the free "egg" plan to try it out and upgrade to paid plan
any time you want.