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The problem laptop is running Windows 7, using Thunderbird 45.8.0.
Settings are:
Error message is:

If I change that user name to the email address, I get:

What other information do you need? Thanks in advance.
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And so we return to my first answer: did you try to set up options differing from yours?
So we changed the password in Thunderbird, and now we don't get the error message, but we also don't get email in the inbox in Thunderbird. It says it is connected, but it never downloads the email.

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it is mostly resolved— I think that the word "mostly" is the keyword here.
And I can suppose several scenarios when one is unable to get mail with mail client whilst webmail is working fine.






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Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.