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multiple o boxes

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When I enter an email address in the to box another to box automatically appears. I have just installed thunderbird on a new windows 10 computer and this does not happen in the new installation and I cannot find a setting which enables it.

When I enter an email address in the to box another to box automatically appears. I have just installed thunderbird on a new windows 10 computer and this does not happen in the new installation and I cannot find a setting which enables it.

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