There is a difference between the emails you can use for receiving feedback in case of missing documentation and when receiving invitations to projects.

1. Email for receiving feedback when documentation is missing - this is actually the company email. You will receive feedback on missing documentation and deviations on it. 

You can update this email by going to Manage company and then Company settings.

Then you can go to Contact details and fill in Email. 

This is the email the contractor sees when sending feedback by using the Send feedback button.

2. Email for receiving invitations to projects - this is the email the contractor sends the invitation to.

You can update this email by going to Manage company and then Company settings.

Then you can go to Contact details and fill in Invite email.

This is the email the contractor sees when sending invitations to projects.