I have copied here the results from mail-tester.com of what appears to be the issue with the email addresses low score below. The scores with the minus signs are the main problem particularly the RAZOR2_CF_RANGE scores. I am looking for someone who can correct these issues or improve what is below to bring the overall score up for the email account.
-0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid
This negative score will become positive if the signature is validated. See immediately below.
0.1 DKIM_VALID Message has at least one valid DKIM or DK signature
Great! Your signature is valid
0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain
Great! Your signature is valid and it's coming from your domain name
-0.001 HTML_MESSAGE HTML included in message
No worry, that's expected if you send HTML emails
-0.365 RAZOR2_CF_RANGE_51_100 Razor2 gives confidence level above 50%
-2.43 RAZOR2_CF_RANGE_E8_51_100 Razor2 gives engine 8 confidence level above 50%
-1.729 RAZOR2_CHECK Listed in Razor2 (http://razor.sf.net/)
0.001 SPF_HELO_PASS SPF: HELO matches SPF record
0.001 SPF_PASS SPF: sender matches SPF record
Great! Your SPF is valid