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Please note: Any urgent or specific issues that require Support troubleshooting in private should go directly to Support versus our community.    New to the community? Here’s 10 ways to get the most out of your experience on Mimecaster Central. The parts of the site outlined here are also all accessible in the top left

4xx Error Codes 5xx Error Codes When messages are sent or received between two email servers or Mail Transfer Agents (MTAs), the communication uses a series of numeric SMTP codes. These codes are always in pairs, which means both servers transmit the codes until either the conversation is successful, or fails.   There are two main