Revererted to profSendmail from system with bug fixes (see below).
The previous version incorporated Bill Wheelers initial checking of the
validity of email addresses. However Bill has improved (or at least
changed) this a lot. He has sent us a new version, but we do not have
time to check it out. We will add the functionality later
Bug fixes, etc. SMTP is now called with the address $smtpSender. Default
values for headers now work