Block *.us4.mcsv.net

7.6
SMTP Proxy

Hello
Few days ago there were many host mail server from outside send to my SMTP proxy such as mail1.us4.mcsv.net,mail2.us4.mcsv.net,…mailxx.us4.mcsv.net

how to block like wide *.mcsv.net ? or any advice ?

You may blacklist a whole domain, see http://docs.nethserver.org/en/v7/mail.html#anti-spam

From the docs:

It’s possible to create an ‘Allow’ or ‘Block’ rule even for a complete email domain, not just for a single email address : you just need to specify the desired domain (e.g. : nethserver.org).