Since Gmail is not Knology and web mail, that should work. Many ISP email systems are black listed so you know to not depend on them.
Gmail does not use Knology's email servers so the issue here is unclear to me.
If I send email to friends with knology.net (Wowway.com) addresses it bounces with a message that says I sent spam. It does it using my own account name at iPage, with gmail and with comcast.net - whether from my computer or on Webmail. Knology says it isn't their problem, even though their server is the one that rejects the email. Who do I turn to? Has anyone else had this problem?