How to give every SaaS tenant its own isolated email mailbox using Nylas

Most multi-tenant SaaS applications route all customer emails through a single shared sender identity, which creates risks around deliverability, inbound routing, and per-tenant policy enforcement. When one tenant generates spam complaints or high bounce rates, it can damage email reputation for all other tenants on the same platform. A proposed solution assigns each tenant a dedicated Agent Account — essentially a Nylas grant with its own send identity, inbox, and configurable limits — eliminating cross-tenant interference. Tenants are organized into workspaces that inherit shared policies governing send quotas, storage, and retention, making it straightforward to apply different rules to trial versus enterprise customers. Offboarding is also simplified, as deleting a tenant's grant removes all associated mail, identity, and limits in a single operation without affecting shared infrastructure.