In the Send connector logs, look for the thumbprint of the TLS certificate. To do this, run the following command: Set-SendConnector "" -ProtocolLoggingLevel Verbose To do this, follow these steps:Įnable logging on the Send connector. To resolve this issue, bind the third-party certificate to the SMTP service. This issue occurs if a third-party certificate that is installed on the server that is running Exchange Server is not bound to the SMTP service. TLS negotiation failed with error UnknownCredentials.
Either there are no alternate hosts, or delivery failed to all alternate hosts.Īdditionally, the following entry is logged in the Send connector logs if logging is enabled: I hope you can figure this out, and tell me what I'm doing wrong.When you examine the status of the queue, you notice the following error message:Ĥ51 4.4.0 Primary target IP address responded with: "421 4.4.1 Connection timed out." Attempted failover to alternate host, but that did not succeed. I am sincerely hoping to get help here! I'm attaching screenshots to show what the ISP says are the correct settings for the SMTP server, and what I have on Thunderbird so far. But it is unable to send mail via this account (which has been my principle account for years)/. It also synchronizes with the Spectrum/ TWC server as far as downloading all the files and folders from there perfectly. Thunderbird works like a charm with Gmail. That is, Spectrum is my ISP and so I have used a ".rr.com" account for years. My most important personal email account (with all personal, friends, family, and private matters) is all on a Spectrum (formerly Time Warner Cable) email account. Switching to Thunderbird, everything so far has gone well, except for one very frustrating problem. Now I've quit Office tired of it being destroyed by buggy updates. I've switched back to using Thunderbird on a Windows 10 desktop, after many years of settling for Microsoft and using Outlook via the Office Suite provided by the university where I teach.
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