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Specify the top domain by approval or blocking sender in Quarantine Portal
Article ID: 172534
According to Online Help for Quarantine Portal, you specify the top domain as ".com" or ".uk" for approval or blocking sender, but it is invalid using Symantec Email Security.Cloud (SESC).
When specifying the top domain for approval or blocking sender, you need to specify "com" or "uk" without putting a dot in front of the top domain.