qmail-inject error

[Kristina]

The first time I did a mail test to my mailbox kristina it worked. However,
the second time it wouldn't work any more. I get the following error:


% echo to: kristina | /var/qmail/bin/qmail-inject
/var/qmail/bin/qmail-inject: to:: not found


the second part "/var/qmail/bin/qmail-inject" seems to be causing the error.
The permissions for qmail-inject are: 
-rwxr-xr-x   1 root     qmail         13 Jan  4 11:47 qmail-inject

Thanks in advance for your help,
Kristina