Hi,
On Trello it is not possible. But you can use Hipporello power up for this purpose. You can define a form for your client to submit their requests. A Trello card will be created for the submission. After this, your client can follow progress for his request from the service desk portal provided by Hipporello and your team may continue to use Trello to manage it. Your team can communicate further over Trello card. They don't need to open their email. Every new response will trigger an email notification for your customer.
You can forward emails coming to your support@, sales@ like emails to Hipporello. For every forwarded email a Trello card will be created. Like form's case, your team does not need to open email application to communicate further.
Besides these, you can define some automation rules like sending an email right after the request is received or when the Trello card is archived. You can define which of your clients can access which forms using access policy management.
We have many more features, please check our website and Trello power-up page
https://www.hipporello.com
https://trello.com/power-ups/5dd670e21b2a8973687ca15a
Best
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