This is a dumb brute-force parser for the output of mailq. If you just want to get the messages from MAILER-DAEMON you can check $entry->{from} when you are iterating over @entries:
my $header = 1;
my @entries;
my $entry = {};
while(<>)
{
if ($header)
{
$header = 0 if /^--/;
next;
}
if (/^(\S+)\s+(\d+)\s+(.+?)\s+<?(\S+)>?/)
{
push @entries, $entry if exists $entry->{msg_id};
$entry = {};
$entry->{msg_id} = $1;
$entry->{size} = $2;
$msg->{date} = $3;
$msg->{from} = $4;
}
elsif (/\s+\((.*)\)/)
{
$entry->{message} = $1;
}
elsif ( /\s+<(.*)>?/ )
{
$entry->{recipients} = [] unless exists $entry->{recipients};
push @{$entry->{recipients}}, $1;
}
}
push @entries, $entry if exists $entry->{msg_id};
foreach $entry ( @entries )
{
print $entry->{msg_id}, join " ", @{$entry->{recipients}},"\n";
}
/J\