EmailDiscussions.com - Spam but not

Could anyone peruse these headers and maybe throw some light on why they would only warrant a -4 score please?
Many thanks

Code:

Return-Path: <N.White-richard=c****s.com@ll**dsbankbacs.com>

Received: from ll**dsbankbacs.com (196.154.21.46.static.swif*way.net [46.21.154.196]) by galaxy.thinking*ish.com with SMTP;

Thu, 30 Aug 2018 13:12:49 +0100

DKIM-Signature: v=1; a=rsa-sha1; c=relaxed/relaxed; s=key; d=ll**dsbankbacs.com;

h=Mime-Version:To:Subject:From:Date:Content-Type:Message-ID;

bh=EOJ5sdf+KNjA9YuR7BpjEu08bL8=;

b=1rev6uEyjTY4D9YTapVj3GqLrclpeYN0rcp8o0zMir9KXp5ei9RCAbeKEKtkgI+t4VEGK5I5LEJm

3QZcurXmVHCOEw7j3an7ZvZwYDCxyhecsjOUPcyfGWenymO+Z9NcAM/ld1Y2311u6MHO6ZWSgO2P

KmrII/sahsacXTIji/Q=

Received: by ll**dsbankbacs.com id hgvfqqmdero7 for <richard@c****s.com>; Thu, 30 Aug 2018 08:04:28 -0400 (envelope-from <N.White-richard=c****s.com@ll**dsbankbacs.com>)

Mime-Version: 1.0

To: richard@c****s.com

Subject: Please find attached your incoming BACs documents.

From: "Natalie White" <N.White@ll**dsbankbacs.com>

Date: Thu, 30 Aug 2018 08:04:28 -0400

Content-Type: multipart/mixed;

boundary=a5e0da94bfbcecccf46ee212d82b4e45

Message-ID: <0.0.3.1.1D440599A072D6C.A525793@ll**dsbankbacs.com>

X-SmarterMail-Spam: SPF_Pass, Reverse DNS Lookup [Passed], ISpamAssassin 0 [raw: 0], DK_None, DKIM_Pass

X-SmarterMail-TotalSpamWeight: -4