This was from trying to get a quote about using Collabora on my account a while ago, only just remembered. Some headers snipped.
Message-ID: <email@example.com,www.forum.indie.host> Subject: [Forum IndieHosters] Email issue -- Invalid Access We're sorry, but your email message to ["firstname.lastname@example.org"] (titled Collabora) didn't work. Your account does not have the privileges to post new topics in that category. If you believe this is an error, [contact a staff member](http://forum.indie.host,www.forum.indie.host/about).