[exim] DKIM signature where the identity field has a leading…

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Author: Tony Meyer
To: exim users
Subject: [exim] DKIM signature where the identity field has a leading slash attempts to touch the filesystem

If a message contains a DKIM signature header where the identity field
begins with a slash, like
"/free_electronic_cigarette@???", then entries like
the following appear in the paniclog:

2011-04-25 13:41:50 1QEL6r-0007jM-VV failed to open
/free_electronic_cigarette@??? when checking
No such file or directory

Example headers (the identity field was added to an otherwise valid
signature produced by Exim, but the identify is one I'm seeing
regularly in practice):

Date: Tue, 3 May 2011 12:54:28 +0400
From: tony.meyer@???
To: tony@???
DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed;
d=spamexperts.com; s=testing;
h=Message-ID:Subject; bh=Hy61WwSEndqwKzArKPLZcQPACoRjmbmRdNbnqGWeg+Y=;
Subject: test

Is this a problem?