>If messages are held in the hold queue, it means you're using postfix
>version 2. But, master.cf is changed only for postfix version 1.x. It
>seems you entered the wrong option to the question "Enter the postfix
>version you use[press 1 for 1.x/2 for 2.x, default=1]:" during the
>installation. Uninstall OpenProtect and install it again and this time
>enter the postfix version as 2. That should help you.
I'll reinstall and report back, but it'll have to wait a while before I can do it.