***Disclaimer : it is also known as Invalid RFC 822 Message
Causes
- The migration wont be halted but might exist in the logs if some messages fail.
- Messages usually fail because they don’t meet the requirements for G Suite.
Fixes
Step 1: Access GSMME Show Report Function
Access the GSMME Show Report function, which provides a full report of messages that failed to migrate.
Step 2: Refer GSMME Admin Guide
For details on migration reports, you can refer the GSMME Admin Guide.