Create transformer mapping

Optional filter for matching emails based on fields. For instance filter results to only include emails whose SUBJECT value does CONTAIN given match value. An example payload would be { matches: [{ field: 'SUBJECT', should: 'CONTAIN', value: 'Welcome' }] }. You can also pass conditions such as HAS_ATTACHMENT. If you wish to extract regex matches inside the email content see the getEmailContentMatch method in the EmailController.