Really cool stuff !! Something I need to try out for sure !
Just to bad they didn’t add a multiuser setup example :( !
If you are doing any kind of multiuser mail node, you should have a separate SMTP system in front of this one that performs any necessary validation.
I mean, where else should they show that warning? It’s also posted in the forum. They also edited the documentation page.
Maybe you’re more into mailing list or the like? I’m genuine curious on what/ how/ where you expected getting this kind of information.