c:\@Work\Perl\monks>perl -wMstrict -le
"use 5.014;
 ;;
 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{ \A \s* (?: \S+ \s+){6} \K (\S+) }{ $1 =~ tr/()//dr }xmse;
 print qq{'$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)'
'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)'