Hints , or possibly elbow in ribs needed on parsing a Subject: header to grab the complete string
Three (I hope) Subject variations :
"foo.com, bar.net, blah.org, trivial.com";
"foo.com, bar.net, blah.org & trivial.com";
"foo.com, bar.net, blah.org and trivial.com";

<SNIP CODE>
prints only the first domain, much to my annoyance.

##</code><code>##

my ($first, $second, $third, $fourth) = (/^([\w.-]+((,\s?)|(\s&\s)|(\sand\s)|$))+/)

##</code><code>##

my @topics = split(/(?:,|\s*&|\s*and)\s*/)