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Am on Win 8.1 and Thunderbord won't accept my email-p/w

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Have just downloaded Thunderbird and have tried to configure it but it doesn't accept my email address/ password combination. I have entered it correctly, including the use of capitals. Presumably it *was* asking for my email account password in the box immediately beneath the one asking for my email address? If it's relevant, I notice that when it rejects it, it gives a note in which it adds a superfluous 'mail' after the '@' in my email address; I didn't put this in. Can someone help?

Have just downloaded Thunderbird and have tried to configure it but it doesn't accept my email address/ password combination. I have entered it correctly, including the use of capitals. Presumably it *was* asking for my email account password in the box immediately beneath the one asking for my email address? If it's relevant, I notice that when it rejects it, it gives a note in which it adds a superfluous 'mail' after the '@' in my email address; I didn't put this in. Can someone help?

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