Sending-only does not require a mailbox server. Incoming Mail is a separate activation. Connecting a sender domain does not automatically create mailboxes.
Prepare a sender domain
1
Choose the connection
Open Mail in the correct workspace and select the intended connection.
2
Add a domain
Use a domain you control. Copy the exact DNS records shown for it.
3
Publish and verify DNS
Add the supplied records with your DNS provider, then request verification. Resolve existing-record conflicts before replacing an SPF or other mail record.
4
Create an application key
Create a sending key, restricted to its sender domain where appropriate. Store it in the application’s private environment.
The expanded Mail API has a verified implementation contract, but production workers and the provider event chain have separate rollout gates. Availability depends on the enabled connection. Incoming-mail integration and advanced sending features must be confirmed for your workspace.