Bocking IP's rather than Email domains

[LC]

> Unless you've applied a lot of patches, Qmail really isn't a very good 
> server.  Most significantly, it doesn't check the recipients of messages 
> before accepting them.  I used to run Qmail, and it was a major hassle.

So apply all the patches and u will have a very good server.
Patch it with chkuser and it will check for local vpopmail users, envelope 
syntax.

> I recommend Courier to Qmail users, since you'll find it very similar. It 
> has a considerably better feature set, to boot. 
> (http://www.courier-mta.org)

I use courier only for imap. best imap server around.