I asked this question before and they referred me to a TWC page showing how to configure the outgoing emails as shown in the following link: https://www.timewarnercable.com/en/support/faqs/faqs-internet/e-mailacco/incoming-outgoing-server-addresses.html See my previous posting from paulherk and answered by Airmail. I let Thunderbird configure the STMP configuration. It configured the STMP as shown in the first screen shot. When I tried to send an email, i received the error message shown in the second screen shot. The set up is what the help page from TWC indicated that it should be.