Error in RC file

I have the following in an rc file:

# Abort if over 24K
* $ B ?? > 24576
{ SWITCHRC= }

:0E
{
  :0
  * ^Content-Transfer-Encoding: base64
  {
     MSGTEXT=`/usr/local/bin/formail -I ""| /usr/local/bin/gbase64 -d`
  }
  :0E
  {
    MSGTEXT=`/usr/local/bin/formail -I ""
  }
}

:0
{
  MSGTEXT=`echo $MSGTEXT | sed 's/-.*8859-1// ' | dd bs=1 count=150`
}

which yields the error in the log

procmail: Skipped "$MSGTEXT | sed 's/-.*8859-1// ' | dd bs=1 count=150`”

I’m not seeing why this would fail.

-- 
Apple broke AppleScripting signatures in Mail.app, so no random signatures.


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