The _Unknown Company is automatically created when one of your customers submits a ticket and they do not exist in your customer database.  

If the submission comes from email, we will try to parse the email header and identify their first name, last name and email address but in some cases it may seem to be incorrect.  This is because the contact did not setup their information correctly in their email client.  You do have the ability to make changes to the contact record and also put them into the company they belong to if you like.

By Default, the _Unknown Company's Portal Access is set to False.  If you would like these types of contacts to use the Advanced Portal, you must first make sure you are licensed to use the Advanced Portal.  If you are unsure, click on the _Unknown Company and from the Details tab, click the Edit Organization button and set the portal access to true and click save.  If it saves, you are licensed.  Otherwise you will see a message letting you know that you are not licensed and to contact sales@teamsupport.com.  The Advanced Portal is a $50/mo add-on.

Once you have give the _Unknown Company portal access, you can provide each contact within the company portal access.  

When your customers visit your portal site, all they have to do is enter their email address and they will be logged in.  If they find they do not have access, there is a link on the portal login page to request access.  This will direct your customer to the ticket submission form where they can submit a ticket to your team.  From there, you can grant them portal access and respond to them with a visible action on the ticket.