multiple o boxes
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.
Chosen solution
Things have changed. See https://support.mozilla.org/en-US/questions/1298772#answer-1340129
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Chosen Solution
Things have changed. See https://support.mozilla.org/en-US/questions/1298772#answer-1340129