Mail::Message::Head::SpamGroup is a Perl module which contains spam fighting related header fields.
is a Mail::Message::Head::FieldGroup
is a Mail::Reporter
my $sg = Mail::Message::Head::SpamGroup->new(head => $head, ...);
my $sg = $head->addSpamGroup( );
my @sgs = $head->spamGroups;
A spam group is a set of header fields which are added by spam detection and spam fighting software. This class knows various details about that software.