c:\@Work\Perl\monks>perl -wMstrict -le
"use 5.010;
 ;;
 print 'perl version: ', $];
 ;;
 my $rec =
   'Jun 12 10 mail (sender@sender.com) - (recip1@domain.com),(recip2@domain.com) -1.889 25623, queued_as: B67837C0052 Subject goes here Sender(sender@sender.com
)';
 print qq{'$rec'};
 ;;
 $rec =~ s/(?:\S+\s+){6}\K(\S+)/(my $x=$1)=~tr,(),,d;$x/e;
 print qq{'$rec'};
"
perl version: 5.010001
'Jun 12 10 mail (sender@sender.com) - (recip1@domain.com),(recip2@domain.com) -1.889 25623, queued_as: B67837C0052 Subject goes here Sender(sender@sender.com)'
'Jun 12 10 mail (sender@sender.com) - recip1@domain.com,recip2@domain.com -1.889 25623, queued_as: B67837C0052 Subject goes here Sender(sender@sender.com)'

##</code><code>##

c:\@Work\Perl\monks>perl -wMstrict -le
"print 'perl version: ', $];
 ;;
 my $rec =
   'Jun 12 10 mail (sender@sender.com) - (recip1@domain.com),(recip2@domain.com) -1.889 25623, queued_as: B67837C0052 Subject goes here Sender(sender@sender.com)';
 print qq{'$rec'};
 ;;
 $rec =~ s/((?:\S+\s+){6})(\S+)/(my $x=$2)=~tr,(),,d;$1.$x/e;
 print qq{'$rec'};
"
perl version: 5.008009
'Jun 12 10 mail (sender@sender.com) - (recip1@domain.com),(recip2@domain.com) -1.889 25623, queued_as: B67837C0052 Subject goes here Sender(sender@sender.com)'
'Jun 12 10 mail (sender@sender.com) - recip1@domain.com,recip2@domain.com -1.889 25623, queued_as: B67837C0052 Subject goes here Sender(sender@sender.com)'