#38 Usermin won't send mail

[unixnewbie]

Users can read mail. When they try to send, Usermin
says it was successful but the recipient receives an
"empty" email (nothing but the header). All subject and
body text is stripped out. Eudora, Outlook Express, and
Apple Mail clients all work as expected.

OS X Server 10.2.8
SMTP - Postfix
POP - AppleMailService

Postfix spools to /var/mail, uses sendmail command to
send mail.

Any help would be appreciated.