Matching received headers

I'm trying to check the received headers for a certain combination.

Spammers now send messages claiming to be "From:" me. I want to make sure the 
message came from my server. A valid received header reads:

Received: from slartibartfast.homebody.net (unknown [192.168.1.3])
        by email1.homebody.net (Postfix) with ESMTP id 6EDB9740DF
        for <lhoffner(_at_)directedmotion(_dot_)com>; Mon, 21 Jun 2004 06:14:25 
-0500 (CDT)

I'm extracting the header with this recipe:

:0
^From:.*\<(lhoffner(_at_)directedmotion(_dot_)com)
{
        REC=`formail -zx "Received:"`
        :0
        * ? $REC = 'from slartibartfast.homebody.net (unknown [192.168.1.3]) by 
email1.homebody.net (Postfix)*'
        {
                :0 :
                $MAILDIR
        }
}

Here, I want $REC to match this particular beginning of a string for 
Received:, plus anything after.

But my logs report:
/bin/sh: line 1: test: too many arguments

Have I written bad syntax?

Thanks!

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