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Once again I am travelling and using hotel Wi-Fi to check my email on Cox using Outlook, and can't send email. I searched the forum to see if there was a solution posted, but apparently Cox doesn't allow it. Numerous postings about this issue, but no solutions. I found a work around several years ago for my travels both inside and outside the USA.
My router has OpenVPN included in the firmware. I've setup OpenVPN on my router, and enabled full tunnel through it so my laptop is tunneling through my home router. I have full access to my email via Outlook. I also use the OpenVPN on my laptop and iPhone when travelling in non-English speaking countries for my web searches are in English.
To enable full tunnel on your OpenVPN router export the clientconfig.opvn file from your router. Open the file and add redirect-gateway def1 as shown below. It took me a while to figure it out, but it works great and no more issues connecting to Cox servers when I am away from home.
ns-cert-type serverauth-user-passverb 3redirect-gateway def1<ca>-----BEGIN CERTIFICATE-----
I also just figured out today that on my ASUS router I can use the built in Instant Guard VPN and accomplish the same as OpenVPN. I’m traveling in Texas this week and couldn’t send an email on my Cox account without going through my router. Cox has gone overboard with their restrictions.