This file is indexed.

/usr/share/qpsmtpd/plugins/content_log is in qpsmtpd 0.94-2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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#!perl -w

# A simple example of a plugin that logs all incoming mail to a file.
# Useful for debugging other plugins or keeping an archive of things.

use POSIX qw:strftime:;

sub hook_data_post {
    my ($self, $transaction) = @_;

    # as a decent default, log on a per-day-basis
    my $date = strftime("%Y%m%d", localtime(time));
    open(my $out, ">>mail/$date")
      or return (DECLINED, "Could not open log file.. continuing anyway");

    $transaction->header->print($out);
    $transaction->body_resetpos;
    while (my $line = $transaction->body_getline) {
        print $out $line;
    }

    close $out;

    return (DECLINED, "successfully saved message.. continuing");
}