Email to specific request queue topics

Workfront has built in functionality to somewhat do this already with the 'Enable Request intake via email' setting under the 'Queue Details' tab of a project. There is one caveat however:

• If the request queue has multiple queue topics or topic groups, Workfront will randomly select the queue topic that the emailed requests will go to, making emailed requests hard to manage.
  We recommend that the project that you set up to receive requests through emails should not have more than one queue topic. If the submitted requests are intended for different resources or projects you should route or move them manually, after they have been submitted.

If you need an emailed issue to go to a specific queue topic via email, you could use an email module in Fusion that watches for incoming emails. You will need to parse though the data of the incoming email and use following modules to create an issue in your intended queue under the targeted queue topic. If issues for multiple queue topics will be emailed to this same email though, you will need to add filters based on the text or subject of the email that designates how they should be handled.

A second method is using the built in 'Enable Request intake via email' setting in one project, then take those requests and recreate them under your intended queue and queue topic using a Fusion module that watches for new issues added. This eliminates the need for an email module in Fusion as some company security policies may block that module from working.

https://experienceleague.adobe.com/en/docs/workfront/using/manage-work/requests/create-requests/enable-email-issues-into-projects