When using using tools like wufoo or jotform the email incoming is from no-reply@jotform.com (sender email). That creates the tickets and assigns the ticket to the user no-reply@jotform.com. Jotform/wufoo have the capability to use an email collected in their form to add as the "reply-to email". I use this currently with zendesk from both wufoo/jotform so the tickets are assigned to the correct requestor.

Please add that as an option for inbound email tickets or the ability to run a ticket automation to update the requester based on this attribute.