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![Some email could not receive email and our M365 exchange warning this error](/media/postImages/original/IMsyvXCMxORK6e2E7hLuHnoA)

We have been using the AWS SES service for username and password information for our customers.

But some customers could not receive email and SES show up there is no Rejected email. But our exchange message has an error as attached. what is the problem?

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