Case insensitive host and mailbox comparisons

I have a receiving mailbox which has been configured with an uppercase character. This creates problems when sending to gmail, for example, since they convert the address to all lowercase and then the return email is rejected. Conversely, if I config the mailbox in Drupal as lowercase, my domain servers will uppercase internal e-mails and they will be rejected. In mailcomment_mailhandler() I'd like to switch the match logic to:

  // If not a catchall, check only for direct matches
  if (in_array(strtolower($to), array_filter(mailcomment_mailboxes(), 'strtolower'))) {
    $matched = TRUE;
  }
  // Do host match for catchalls
  else if (in_array(strtolower($header->to[0]->host), array_filter($hosts, 'strtolower'))) {
    $matched = TRUE;
  }

If that looks sensible I will create a patch.