How to Set up Salesforce Email Relay: Full Guide with Examples

Salesforce Email Relay routes emails created in Salesforce through an organization’s own or third-party SMTP server rather than Salesforce’s default sending infrastructure, allowing continued use of Salesforce templates and personalization while providing greater control over deliverability, sender reputation, compliance logging, security, and content governance. Setup in Lightning Experience involves creating a relay, entering SMTP details, defining sender and recipient domain filters, and activating the service, with supported editions including Professional, Enterprise, Performance, Unlimited, and Developer. Relaying does not increase Salesforce sending quotas, which generally limit individual users to 250 external recipients per hour and organizations to 5,000 external recipients daily for several email categories. The guidance outlines configurations for Mailtrap, Google Workspace Gmail, and Microsoft 365, while noting that Microsoft 365 external delivery is not officially supported by Salesforce and may require additional connector, IP allowlist, and mail-flow configuration. Testing can be performed with Salesforce’s Test Deliverability feature, while Mailtrap Email Sandbox can capture and inspect messages, including rendered content, headers, attachments, merge fields, and spam scores, before delivery to real recipients.

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