mail.twc.com SMTP: RECEIVED: 421 Service not available, closing transmission channel - Time Warner Internet

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This question is about "mail.twc.com SMTP: RECEIVED: 421 Service not available, closing transmission channel", with Time Warner Cable internet and apps. Since about mid-day 9/24 mail.twc.com SMTP on port 587 returns a 421 response upon connection. My understanding is 421 means the SMTP server is unable to function.



I am unable to send any email via the mail.twc.com SMTP server.



The following is the logs of the communication (the '*' are for privacy):



"SMTPC" 6916 43177 "2018-09-25 08:23:30.384" "107.14.73.68" "RECEIVED: 220 Welcome to Road Runner. WARNING: *** FOR AUTHORIZED USE ONLY! ***"
"SMTPC" 6916 43177 "2018-09-25 08:23:30.384" "107.14.73.68" "SENT: EHLO ******.***"
"SMTPC" 6724 43177 "2018-09-25 08:23:32.424" "107.14.73.68" "RECEIVED: 421 Service not available, closing transmission channel"



Please advise as to when the email server will be fixed.



Thanks

mail.twc.com SMTP: RECEIVED: 421 Service not available, closing transmission channel?
 
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