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When two email servers, or Mail Transfer Agents (MTAs), send and receive emails between each other, they communicate using a series of numeric codes.  These SMTP codes always take place in pairs, which means that both of the servers will transmit SMTP codes, until either the conversation is successful, or fails.   When troubleshooting
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Using the Rejection Viewer Common Rejection Types and Resolutions Troubleshooting Failed Email Delivery Messages blocked by Mimecast in protocol are displayed in The Rejection Viewer. Mimecast rejects emails that match certain criteria (e.g. they contain a virus signature, destined to a recipient that doesn't exist). In
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