qpsmtpd/plugins/check_badrcptto

# this plugin checks the badrcptto config (like badmailfrom for rcpt address)

sub register {
  my ($self, $qp) = @_;
  $self->register_hook("rcpt", "check_for_badrcptto");
}

sub check_for_badrcptto {
  my ($self, $transaction, $recipient) = @_;
  my @badrcptto = $self->qp->config("badrcptto") or return (DECLINED);
  return (DECLINED) unless $recipient->host && $recipient->user;
  my $host = lc $recipient->host;
  my $from = $recipient->user . '@' . $host;
  for my $bad (@badrcptto) {
    $bad =~ s/^\s*(\S+)/$1/;
    return (DENY, "mail to $bad not accepted here")
      if $bad eq $from;
    return (DENY, "mail to $bad not accepted here")
      if substr($bad,0,1) eq '@' && $bad eq "@$host";
  }
  return (DECLINED);
}