Enhanced check_badmailfrom plugin for qpsmtpd

[Peter Walter]

The current check_badmailfrom plugin is somewhat useless for spam 
control because it requires literal matches on domain names, and the 
spammers tend to use varying subdomains in the HELO, such as 
mx1.domain.com, mx2.domain2, etc., where, once you block a specific 
subdomain, they simply use another. I assume they do that because it is 
cheaper to re-use the domain name, rather than registering a new one.

I am looking for an enhanced version of the check_badmailfrom plugin 
that also supports wildcards (as in .domain.com) or regular expressions. 
Does anyone here know where I might find such a plugin?

Regards,
Peter