To use this DOS sendmail kludge, put the following line in lynx.cfg:

SYSTEM_MAIL:sendmail

You also need to edit sendmail.bat and change your.mail.host to the
correct one and also change the values in wattcp.cfg.  It *should*
work after that, but it is just a hack so there may be problems.
Post a message to the lynx-dev list if you have questions.