I always do the install routine for blat, or write the following keys:
Code:

HKLM\SOFTWARE\Public Domain\Blat
Sender=sender@somewhere.com
SMTP Port=25
SMTP Server=myserver
TRY=5


And the command line BLAT FILENAME.TXT -to %recipient% -subject %subject%, always works for me. It basically places the contents of FILENAME.TXT as the body of the message.
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-- oobnuker - .KIX hack - no really.