Whitelist advice, correct way to minimize score

[Voytek]

Just installed amavisd , all working well, for my own email set sieve to send to spam 3 and above, overall, seems to work well, though, noticed some FP, this below is a valid email to me, what's the proper way to do this, should I just add  "tld.com.au" to a whitelist, or how to do this, I wish to receive these emails?

X-Virus-Scanned: amavisd-new at sbt.net.au
X-Spam-Flag: NO
X-Spam-Score: 3.039
X-Spam-Level: ***
X-Spam-Status: No, score=3.039 tagged_above=2 required=6.2	tests=[DKIM_SIGNED=0.1, DKIM_VALID=-0.1,	HEADER_FROM_DIFFERENT_DOMAINS=0.25, HTML_IMAGE_ONLY_16=1.048,	HTML_MESSAGE=0.001, HTML_MIME_NO_HTML_TAG=0.635, MIME_HTML_ONLY=1.105,	SPF_PASS=-0.001, T_REMOTE_IMAGE=0.01, T_RP_MATCHES_RCVD=-0.01,	URIBL_BLOCKED=0.001] autolearn=no autolearn_force=no
Authentication-Results: geko.sbt.net.au (amavisd-new);	dkim=pass (1024-bit key) header.d=sendgrid.net
From: "eeerer" <admin at tld.com.au>
-- 
Sent from my Android device with K-9 Mail. Please excuse my brevity.
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