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One Tenant's Bad Mailing List Can Drag Down Shared SES Sender Reputation

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A multi-tenant SaaS running on Amazon SES shares one account and one sender reputation across all tenants, so a single tenant's poor list hygiene can affect everyone. Imported or purchased lists can cause hard bounces and spam complaints that push the account's bounce or complaint rates past SES thresholds, leading to account review or paused sending for every tenant. The author argues this is an architecture problem rather than one solved by monitoring alone. Recommended isolation measures include per-tenant sending subdomains, per-tenant configuration sets for attributed event tracking, and dedicated IP pools reserved for tenants with steady volume. Per-tenant event ledgers and suppression lists are also suggested so each tenant's reputation can be measured and enforced separately.

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