Excluding Commands from CommandbyMail parsing

I've implemented the CommandbyMail extension (
http://search.cpan.org/dist/RT-Extension-CommandByMail/lib/RT/Extension/CommandByMail.pm)
in my RT 4.4.4 installation. It works well - almost too well!  I am getting
"Extended Mailgate Errors" returned because the plugin is parsing the
message body for "Command: value" (which it is meant to do) and picking up,
in emails forwarded to RT:

"To: [email protected]"
"From: [email protected]"
"sent: the_date_sent"

And trying to process them as commands.

In addition, forwarded emails have "Subject: [Support ID #12345]
some_new_subject" and this is changing the subject of the RT job to the new
subject, which is different from the subject used when the ticket was
originally created.

Is there a way to stop CommandbyMail from parsing "to:" "from" and "sent:"
as commands, or at least configuring it to not return errors when it fails
to match it to a valid command? And is there a way to prevent parsing
"Subject: xxxx" so that my subjects no longer change?

---------
RT 4.4 and RTIR training sessions, and a new workshop day! https://bestpractical.com/training
* Boston - October 24-26
* Los Angeles - Q1 2017