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I did not sign up for Thunderbird email. I am at Yahoo. Am I being charged for Thunderbird

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How did Thunderbird get to be my email server and am I being charged for it? I did not sign up for it.

How did Thunderbird get to be my email server and am I being charged for it? I did not sign up for it.

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Thunderbird is free email client software. You or someone would have had to install it on your computer.

You might Google the difference between email client software and an email provider.