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Trouble sending email

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For the last few days, when I open Thunderbird email, I get the below error. The current operation on "Sent" did not succeed. The mail server for account d######### responded: Unrecognized command ID. Cannot send emails either, get and error box stating: Log-in failed, log-in to server: smtp.windstream.net failed. Can you help.

For the last few days, when I open Thunderbird email, I get the below error. The current operation on "Sent" did not succeed. The mail server for account d######### responded: Unrecognized command ID. Cannot send emails either, get and error box stating: Log-in failed, log-in to server: smtp.windstream.net failed. Can you help.

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We have had another poster reporting issues with windstream.

https://support.mozilla.org/en-US/questions/1193677

Maybe this is a problem at windstream? Have you raised this with them?