The “Send an Email” UI sends emails with an unsubscribe link pointing to
https://link.trooptrack.com/wf/unsubscribe
The SSL certificate is only valid for *.sendgrid.net.
The unsubscribe link does not point to link.trooptrack.com any longer the unsubscribe works now, I only tested from one e-mail so if it happens with others please post again or send an e-mail to dave@trooptrack.com with the specific e-mail so he can look into it.