Suppression types
What happens when you send to a suppressed address
The send request returns422 with a typed error:
Core concepts
Suppressions
OpenMail automatically suppresses sending to addresses that have bounced or unsubscribed. Learn how suppressions work and how to manage the list.
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.
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 maintaining good deliverability. For the full picture — warm-up strategy, inbox distribution, and content best practices — see Email deliverability.