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Please Help, doesn't work. When i press mail merge it appears error message "invalid recipient address" and i can't go to the windows where i can choose the .csv file. Last May worked perfectly. Thunderbird v. 78.7.1 (64-bit) and mail merge v. 7.3.1

Found this solution: You must hit "Enter" or "Tab" once you have added the variable(s) in the To field.

这个评论是针对附加组件的一个早期版本的(7.3.1)。