Don Hodgkins

I have an email account with Time Warner Cable through Roadrunner email. I have the following SMTP settings. SMTP Server - Outgoing, Server Name: mail.twc.com, Port: 587, Username: dhodgkins@oh.rr.com, Authentication Method: Normal Password, and Connection Security: SSL/TLS. My incoming email is functioning properly with the following settings, IMAP Server - Incoming, Server Name: mail.twc.com, Port: 993, Username: dhodgkins@oh.rr.com, Connection Security: SSL/TLS, and Authentication Method: Normal Password. I have tried to send myself a test email to verify that the email was being sent and received. Thunderbird shows a message that the email is being set. About 30 seconds later I get a message that the email was not sent. The error it states is that the SMTP settings may be incorrect. I had Thunderbird about 3 years ago with the same email setup as above and was able to send/receive emails. Then after about 2 and 1/2 years later, all of a sudden the outgoing mail was not being sent. I ran into the same problem I have stated above. I had to switch to Internet email in order to send/receive my email. I had mremoved Thunderbird at the time I ran into the problem. I reinstalled Thunderbird about 2 days ago and as I stated, the problem still exists. Can you offer me any assistance in correcting this problem? Thank you for your time and any help you may be able to offer. Don Hodgkins