I'm using spamassassin (3.2.5) with Postfix and DKIM-Filter 2.6.0.

Spamassassin runs as content filter (spamd/spamc).

Sometimes I see E-Mails with a DKIM-Header like this:

Return-Path: <[email protected]>
Delivered-To: [email protected]
Received: by tux.example.com (Postfix, from userid 5000)
        id 2283ABFC498; Sat, 28 Feb 2009 03:56:39 +0100 (CET)
DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=example.com; s=dkim;
        t=1235789799; bh=zJ1+kHScE37nC6hkRjKNEiW4N/YtHBrzZMkN7Wq9b0A=;
        h=From:To:Subject:Date:Message-Id:MIME-Version:Content-Type; b=gyPd
        zP5tVOY6cmtDI03emtkq4MqauGxNMq930IvE+66a6l9eLo1It/6X9ZoPi4iT1+1Vg
        003TYE743HlhIUU2LvYYG478asgaftrsykg7lVtsfeauiFSxHlr3x+BLC0ThDz6FB
        NvMoFseIa9FyajluQeXa86YWtnH6sN1ZI=
Received: from localhost by tux.example.com
        with SpamAssassin (version 3.2.5);

In other E-Mails this header is missing which seems that this should
be correct...

Return-Path: <[email protected]>
Delivered-To: [email protected]
Received: by tux.example.com (Postfix, from userid 5000)
        id F18BABFC498; Sat, 28 Feb 2009 02:59:44 +0100 (CET)
Received: from localhost by tux.example.com
        with SpamAssassin (version 3.2.5);
        Sat, 28 Feb 2009 02:59:44 +0100
From: "Brianna Block" <[email protected]>
To: "Me" <[email protected]>

DKIM signs the spam mails when the sender address is forged (if sender
address is a recipient in mydomain) - but this should not be I think.

Spam comes in, gets signed if sender is a recipient in my local domain
and gets delivered to the mailbox of the user. Are there any settings
to prevent this?

Seba

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