In one of my other postings I did mention that there was a problem and the correct format was using "acl worm urlpath_regex -i \.eml$"
But I did a quick try and it still seem to pass/open a new window for the EML file. I'm not sure if the default e-smith conf file is missing something or what. But it sure doesn't seem to be filtering out those EML links.
Has anyone else tried to do any tests?