When custom coding is used to make a web-to-case or web-to-lead via the API, the auto-response email does not work. The case or lead is generated, but the email response is not sent to the person who submitted it, even if the Auto-Response rule is made and enabled.
For making an auto-response in custom web-to-case or web-to-lead work, the auto-response should be set to true in Email header. The "triggerAutoResponseEmail" field specifically has to be set to "true" in the API call being made in order for auto-response to work with the API. They can be set in the EmailHeader and DmlOptions EmailHeader .
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