Unable/how to send plain-text email?

[tggagne]

I'm trying to send a plain-text message. Specifically, I'm redirecting the output of another command that needs to arrive in a non-proportional font so the output is correctly formatted.

The command looks like:

sendemail \
    -v \
    -s smtpserver:25 \
    -f $LOGNAME@`hostname` \
    -t "$1" \
    -u "$SUBJECT" \
    -o message-file="$TEMPMAILFILE" \
    -o message-content-type=text \
    -o reply-to=$LOGNAME@therealdomain.com

But when the message arrives it's not plain-text.