Deferred due to greylisting

If the Greylisting filter is enabled, the message you are seeing is quite normal, and will be applied to all incoming mail that your server receives. Please see Greylisting - Version 64 Documentation - cPanel Documentation for full details.

WHM Server wide settings
Home >> Email >> Greylisting

Individual cPanel Account settings (per domain)
cPanel >> EMAIL >> Configure Greylisting

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