What is the difference between FROM emails setting and Domains setting in Black/White lists?

I thought that Domains would filter domain names resolved by SpamFilter, eg., if host, trying to connect to SpamFilter, contains in its domain name something like "adsl" or "ppp" or something like that, would disconnect or quarantine. But it doesn't work.

I really missed this feature.

This is super-flexibility, because I can use regular expressions, so using only "FROM emails" I can filter as single emails (say, joe@aol.com), so entire domains (say, *aol.com), isn't it?

So "Domains" would be very useful to set up to filter domain names of hosts, trying to send e-mail to us.

For example, host c-99-99-99-99.client.comcast.net tries to send me a mail, FROM in which is zrqk28@aol.com. So I easily could filter this evil host using regular expression, something like .*client.* or *comcast.net.

This feature could help easily filter all dial-up or DSL senders.