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Functional Subdomains in Unified Messaging
After you send an email, Email Service Providers (ESPs) and subscribers communicate back to the sender for scenarios, such as bounces, replies, or unsubscribes. To manage these inbound communications, Unified Messaging uses functional subdomains.
| Available in: Lightning Experience |
| Available in: Salesforce Enterprise and Unlimited Editions for Service Cloud AND Enterprise and Unlimited Editions with Marketing Cloud Next Growth and Advanced Editions |
| Not supported in Government Cloud Plus |
A functional subdomain is a prefix added to your authenticated sending domain that routes specific inbound mail types to the correct Salesforce-managed infrastructure.
| Inbound Use Case | Functional Subdomain (Prefix) | Purpose |
|---|---|---|
| Reply handling | reply |
Routes recipient replies to Salesforce’s reply-handling servers |
| Bounce handling | bounce |
Receives asynchronous bounce notifications from Internet Service Providers (ISPs) |
| Unsubscribe handling | leave |
Processes unsubscribe requests from recipients |
If your authenticated sending domain is marketing.yourcompany.com, Unified Messaging automatically handles these subdomains:
reply.marketing.yourcompany.combounce.marketing.yourcompany.comleave.marketing.yourcompany.com
To ensure these subdomains route correctly, create CNAME records in your DNS provider that map each functional subdomain to Salesforce-managed inbound mail servers.

