svoid sendMailThroughScript(S senderInfo, S from, S to, S subject, S text) {
  LS l = splitAt(senderInfo, "#");
  if (l(l) != 2) fail("Bad mail sender info");
  S url = first(l), pw = second(l);
  print("Sending mail through " + url);
  print("From: " + from);
  print("To: " + to);
  print("Subject: " + subject);
  print("Text:");
  printIndent("> ", text);
  assertStartsWith("OK", postPage(url, +pw, +from, +to, +subject, +text));
}