Email to create ticket in queue but no portal access

[Danielle Bonneau]

Hello community, 

We have 1 portal and 1 email that's connected to the portal: support@company.com.  We have it configured so customers in approved domains can either create a portal account to create a ticket or email support@company.com.

What we want now is to be able to have vendors email support@company.com and for that to create a ticket in the queue, but for them NOT to have portal access (view or create issues).  I have the vendor as an approved domain, but I don't know how to limit their ability to view the portal. 

Does anyone have recommendations on how to do this?  

Thank you!