Suppressions - OpenMail

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. Suppressions are one part of deliverability. For domain setup, warm-up and content, see Email deliverability.