Add suppressions in bulk
Suppress up to 100 addresses at once. The batch is validated as a whole: one invalid address refuses it and nothing is written. An address already suppressed keeps its entry.
Add a suppression
Suppress an address: no email is sent to it until it is removed. Adding an address already suppressed answers its existing entry.
Remove suppressions in bulk
Remove up to 100 suppressions, named by address or by ID (not both). Each identifier answers an entry: the removed entry's ID with deleted true, or the identifier itself with deleted false when it named no suppression.