When a lookup filter is applied to the standard Account Name or Contact Name field on the Case object, Email-to-Case may fail to create new cases when it cannot match an incoming email to a contact and account that satisfy the filter criteria. The Automated Case User (a system user specified in Support Settings) does not typically have a matching account, which causes the filter validation to fail. The following error is sent to the Automated Case User's email:
Email-to-Case: Error(s) encountered while processing
The following errors were encountered while processing an incoming email:
FIELD_FILTER_VALIDATION_EXCEPTION : Value does not exist or does not match filter criteria.
When Email-to-Case Matches an Email to a Contact it's expected behavior for the new case to be populated with a matching contact and their related account record.
When lookup filters have been created and applied to the case object's standard Contact or Account Name lookup fields and the matching or related account or contact records do not match the filter criteria, the case will not be created in Salesforce.
To allow new cases to be created from Email-to-Case adjust the lookup filter criteria to exclude the "Automated Case User" specified in Support Settings.
On-Demand 'Email-to-Case' Does Not Create Cases
Error 'FIELD_FILTER_VALIDATION_EXCEPTION' on lookup field update
000394275

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