Migrated Yammer emails are generating errors in the target mailbox.
ODM does not classify Yammer emails as a supported mail type for migration.
Yammer content is not included in the supported mail types for On Demand Migration (ODM). Therefore, Yammer messages are not migrated as part of the email migration process.
Refer to the official documentation for the list of supported mail types:
https://support.quest.com/technical-documents/on-demand-migration/current/user-guide/12#TOPIC-2147808
