Connect a controlled test mailbox first. Provider access is a configuration and governance decision, not only a technical setup step.
Step 01
Approve the mailbox
Confirm ownership, intended users, retention expectations and the provider method before authorizing UnionStack.
Step 02
Test both directions
Use harmless messages to verify inbound polling, sender identity, outbound delivery, threads and attachments.
Step 03
Confirm visibility
Test which staff can open the mailbox and how related conversations appear from connected records.