[Q]Redhat 6.0 Error! - service unavailable

Hi,
I need your help.....
I have installed hypermail 2a24v on my Linux redhat 6.o system.

But I have met this error message:

• The following addresses had permanent fatal errors ----- "|/usr/local/bin/hypermail -i -u -d /home/httpd/html/test2 -l "" (expanded from: testml)
• Transcript of session follows ----- 553 /usr/local/majordomo/lists/test2: line 3: "|/usr/local/bin/hypermail

-i -u -d /home/httpd/html/test2 -l "
sh: hypermail not available for sendmail programs 554 "|/usr/local/bin/hypermail -i -u -d /home/httpd/html/test2 -l ""... Service unavailable Received on Thu 09 Sep 1999 08:27:36 AM GMT