Behavior:
Occasionally, when viewing an Inbound Email Message that was created via Email to Case OnDemand, the Text Body field is empty. However, when the Reply or Reply To All button is selected, the content of the email displays in the Body field. The body of the content is blank when the sender is sending only HTML emails. Typically, incoming emails can be either strictly HTML, HTML and Text, or Text.
The behavior stems from the Email to Case setting: Enable HTML Email
To enable this setting:
Salesforce Classic
Lightning Experience
See Also
Inbound Email Message for Email-to-Case Appears as Blank on Case Feed
Email-to-Case Settings
000384410

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