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Password trouble

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I use thunderbird for a protonmail address. Worked fine until I moved house (now fibre broadband). After a couple of weeks of being offline my password doesn't work through thunder bird. Windows 10.

I use thunderbird for a protonmail address. Worked fine until I moved house (now fibre broadband). After a couple of weeks of being offline my password doesn't work through thunder bird. Windows 10.

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It works okay on my yahoo address though.

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I get message Enter your password for Goodshepherds@pm.me on 127.0.0.1: