For Hsphere Windows 2000\2003 servers (most accounts.) c:\hshome\username\domainname.com
For Linux: (specialized hosting accounts) /hsphere/local/home/username/domainname.com
Sendmail is located at /usr/sbin/sendmail
Sendmail for windows is enabled by either user, localhost \ mail.domainname.com \ CDONTS depending on what a particular program\script needs.