Feature - Custom logo URI for notification emails

Our Eramba portal is only accessible internally, it is not currently exposed to the Internet. We have come across an issue with email notifications for awareness training invitations that are read by our users when connected to the Internet (i.e. without VPN). The Eramba logo is not reachable and thus a broken image is seen in the email notification. We know they would still need internal connectivity to reach the portal, but cosmetically the broken image does not look good.
It would be ideal if a new feature is added to specify a custom URI for the logo used in emails sent out to users, so we can point to a publicly accessible image URI. In this way the logo will always be shown, irrespective of whether the users have a connection to reach the internal Eramba portal or not.
Thank you