@d19dotca Wouldn't you create a single mailbox called say admin@ and then put your standard addresses as aliases of that mailbox?
Ah, I forgot you can add other domains as aliases now, so yes I suppose in my case I could use my main email address at my own domain and add in aliases of postmaster and webmaster and abuse and hostmaster for each domain from the same window, this would definitely save a little bit of time as I couldn't need to add from each domain page individually. Ideally though it'd be great to have some of those standard ones just be auto-created for example and setting it to one email or something since those emails are generally required for proper RFC compliance.
I'll work in the meantime on migrating from the old system I had to the new system. I created those before the multi-domain email aliases was added. 😉