Amazon SES Organization Reputation

In Amazon SES, reputation management operates at different levels of isolation depending on how you structure your email sending.

When using tenant management within a single AWS account, each tenant has its own isolated reputation metrics and can be independently monitored and managed. However, it's important to understand that while tenant reputation is tracked separately, the combined sending activity of all tenants still affects your overall account reputation. If one tenant develops poor sending practices, it could put your entire account at risk.

Regarding your specific question about multiple accounts within an organization: AWS accounts are separate entities from a reputation management perspective. The reputation issues in one AWS account will not directly affect other AWS accounts within your organization. Each AWS account maintains its own separate Amazon SES sending reputation.

This means that if Account A experiences reputation issues due to poor tenant practices, those reputation problems would be isolated to Account A and would not impact the sending ability or reputation of Account B, C, or other accounts within your organization.

This account-level isolation provides an additional layer of protection for organizations that need to maintain strict separation between different business units or customer groups.
Sources
Tenants - Amazon Simple Email Service
Tenant Management in Amazon SES | AWS re:Post