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Can't send or rceive emails; get message 'Authentification Failed' What should I do?

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I have suddenly been unable to send or receive emails. I get a message 'Sending of password for user ............ did not succeed. Mail server ......... responded: Authentication failed. I am then asked to enter a new password but this is not accepted. What should I do?

I have suddenly been unable to send or receive emails. I get a message 'Sending of password for user ............ did not succeed. Mail server ......... responded: Authentication failed. I am then asked to enter a new password but this is not accepted. What should I do?

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Mail server .........

What is the mail server?

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christ1
christ1
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Mail server .........

What is the mail server?