Hey Mark,
Thanks for reaching out with this question.
I just checked your SPF record and it appears that you have removed the bad host include.
v=spf1 a mx include:authsmtp.com ip4:204.12.43.77 ip4:208.112.18.36 include:spf.criticalimpactinc.com ~all
I will go ahead and mark Sebastien's answer as the answer to this question.
Have a great rest of your week.
Kind Regards,
Zach Sylvester
Software Developer
SmarterTools Inc.
www.smartertools.com