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Sending of the message failed.
"Sending of the message failed. An error occurred while sending mail. The mail server responded: <rdole3@nc.rr.com> sender rejected. The email address you are sending as must match the email address you used to auth. Please check your SMTP settings. AUP#Out-1500. Please verify that your email address is correct in your account settings and try again."
I validated server settings for twc.com and my current email address. Connectivity with TWC continues to work properly on my Iphone and Ipad using the same settings. This just happened overnight.
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What user name are you using for your connection to TWC in account settings. Look under outgoing server (SMTP). It must be rdole3@nc.rr.com. I am guessing it is not set to that but something for TWC or and even later owner of the service.