Sub-tenancy should not be an enterprise-only feature for email platforms

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The author argues that multi-tenancy in email APIs such as Mailgun's subaccounts, priced at $90 per month on its Scale plan, is bolted on rather than built into the data model. When a platform sends email on behalf of customers, one tenant's bad sending practices, such as importing a dirty list, can damage deliverability for every other customer. The author contends that the customers who most need a tenant boundary are often priced out of it until problems have already occurred. The post notes that the author built Rootmail with tenant boundaries in its schema and is inviting eight free closed-beta testers to report issues. It closes by asking platform operators when sub-tenancy became necessary for them.

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