Suppressions

Automatic protection against sending to bad addresses

When an email bounces, a recipient marks your email as spam, or someone unsubscribes, we automatically add them to your suppression list. Subsequent send attempts to that address are rejected.

Suppression types

Type	Trigger	What it means
bounce	Hard bounce from recipient server	Address is invalid or doesn’t exist
complaint	Recipient clicked “Report spam”	Recipient doesn’t want email from you
unsub	Recipient unsubscribed	Recipient opted out

What happens when you send to a suppressed address

The send request returns 422 with a typed error:

{
  "error": "recipient_suppressed",
  "type": "complaint"
}

Your agent should handle this gracefully — for example, by noting that the contact is unreachable and trying an alternative communication channel.