Thank you for bringing this to our attention, this is a known bug because we do a "HELO pws1-mxtoolbox" instead of using a FQDN with the HELO. Users can ignore this warning, but we do appreciate the feedback and concern.
Please let us know if we can help with anything else.
Thank you,
Wendy
Wendy
MXToolBox Support
support@mxtoolbox.com