missing documentation: rejectunknown / rejectunknownsender

[Elompenta]

Hi together,
is there some more documentation to explain the configurations "Reject Unknown Clients" and "Reject Unknown Senders" in Configuration :: Mail Proxy :: Options ?

In the docu is written:

rejectunknown: <boolean> (default = 0)
Reject unknown clients.

rejectunknownsender: <boolean> (default = 0)
Reject unknown senders.

I not really understand what these configurations do in detail.

 

[hata_ph]

PMG use postfix, check out postfix documentation.

https://www.postfix.org/postconf.5.html#reject_unknown_client_hostname

 

[poetry]

Can someone give information how it this shown in the logs?

For example Reject unknown clients in the logs is shown as:
Client host rejected: cannot find your hostname
Is this correct?

What about Reject unknown senders how is that shown in the logs?
EDIT: Looks like it's this
Sender address rejected: Domain not found