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e-mail account working at web firefox, fails at thunderbird [user name or password invalid] Ho can I fix this?

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I create an e-mail account at unseen.is

I have sent and received e-mail to and from that account, using Firefox browser and the e-mail service page. .

I created / setup this e-mail using Thundebird. and it works ok

BUT: I create a second e-mail account also at unseen.is, and that second account works ok [sent and receive e-mail to and from that account, WHEN using Firefox browser and the e-mail service page WEB. ]

PROBLEM: I cannot create / setup the second e-mail using Thundebird.


What I get is: user name or password invalid - AND configuration could not be verified - is the username or password wrong?

as you can see at screenshot pic. I uploaded.

thanks.

I create an e-mail account at unseen.is I have sent and received e-mail to and from that account, using Firefox browser and the e-mail service page. . I created / setup this e-mail using Thundebird. and it works ok BUT: I create a second e-mail account also at unseen.is, and that second account works ok [sent and receive e-mail to and from that account, WHEN using Firefox browser and the e-mail service page WEB. ] PROBLEM: I cannot create / setup the second e-mail using Thundebird. What I get is: user name or password invalid - AND configuration could not be verified - is the username or password wrong? as you can see at screenshot pic. I uploaded. thanks.

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screen shot of what I have got from thundebird [ i've mentionnede above]

Have you tried the username with the full email address, that is, including the "@unseen.is"?